USCG Master or Chief Mate Offshore Supply
Vessel Exam | Practice Exam Q&A
ID14105
,USCG Master or Chief Mate Offshore Supply Vessel Exam | Practice Exam Q&A
1. An alarm appears after a change in plant configuration. With respect to Marine 10. A position fix disagrees with the expected track. Which action is most likely
engineering or electrical systems applicable to the named officer/module, what is to prevent recurrence of a problem involving professional watchkeeping standards?
the best FIRST action? A. Rely on one electronic source when independent information conflicts.
A. Disable an alarm that is interrupting operations. B. Make a series of small course changes that are difficult to detect.
B. Reset a protective trip repeatedly without finding the cause. C. Cross-check position, traffic and navigation sources before altering the passage
C. Increase machinery load to see whether the abnormal indication clears. plan, then confirm that the corrective action is effective before closure.
D. Protect the plant, verify the indication and diagnose the affected system before D. Continue on an uncertain position until the next scheduled fix.
resetting or increasing load. Correct Answer: C
Correct Answer: D Explanation: This approach preserves control of the situation while producing evidence
Explanation: The correct response protects the integrity of the process: establish the that can confirm whether the action actually corrected the issue involving professional
facts, apply the appropriate control, and verify the result before closure. watchkeeping standards.
2. An electrical protective device trips repeatedly. Which evidence is most 11. An alarm occurs during machinery operation. Which sequence is most
important when evaluating Marine engineering? appropriate when carrying out Communications, GMDSS awareness and
A. Review protective-device indication, circuit condition and recent configuration distress/urgency procedures?
change and compare the findings with the applicable criteria. A. Assume constant bearing is harmless when range is decreasing.
B. Make several plant changes simultaneously before recording the original condition. B. Cross-check navigation sources and resolve a position discrepancy before relying on
C. Increase machinery load to see whether the abnormal indication clears. the fix, then verify the resulting state before moving to the next step.
D. Disable an alarm that is interrupting operations. C. Silence a machinery alarm and continue at the same load without investigation.
Correct Answer: A D. Use a single navigation source after another source shows a material discrepancy.
Explanation: This approach preserves control of the situation while producing evidence Correct Answer: B
that can confirm whether the action actually corrected the issue involving Marine Explanation: This answer uses verified evidence before action, which reduces the chance
engineering. of masking the real problem and supports a traceable decision about Communications,
GMDSS awareness and distress/urgency procedures.
3. A pollution-prevention control is compromised during operations. Which
response best controls the primary risk associated with electrical systems 12. A vessel approaches restricted visibility with traffic nearby; visibility
applicable to the named officer/module? falls below one nautical mile. Which choice demonstrates the strongest control of
A. Silence a machinery alarm and continue at the same load without investigation. GMDSS awareness?
B. Respond to an abnormal machinery indication by protecting the plant, confirming the A. Discharge a small contaminant amount rather than initiating the response procedure.
indication and following the operating procedure. B. Make an unverified ballast change solely to improve trim.
C. Use a single navigation source after another source shows a material discrepancy. C. Contain and report a pollution risk using the required onboard response and
D. Assume constant bearing is harmless when range is decreasing. documentation process.
Correct Answer: B D. Depart with required safety equipment inoperative because the voyage is short.
Explanation: This answer uses verified evidence before action, which reduces the chance Correct Answer: C
of masking the real problem and supports a traceable decision about electrical systems Explanation: The selected action best supports safe, compliant, and technically sound
applicable to the named officer/module. performance because it addresses GMDSS awareness using observable evidence rather than
convenience.
4. Required lifesaving equipment is not ready before departure; a target bearing
remains nearly constant as range decreases. Before proceeding with work involving 13. A towing or deck operation is affected by changing weather. What is required
Pollution prevention, MARPOL principles and environmental protection, what should before accepting the result related to distress/urgency procedures?
be verified? A. Use a single navigation source after another source shows a material discrepancy.
A. Enter an enclosed space based only on a prior atmosphere test. B. Assume constant bearing is harmless when range is decreasing.
B. Wash a small spill overboard rather than initiating the response process. C. Review weather, tide/current, under-keel clearance and route hazards and compare
C. Review equipment inventory, inspection status and operational readiness and compare the findings with the applicable criteria.
the findings with the applicable criteria. D. Silence a machinery alarm and continue at the same load without investigation.
D. Continue the transfer until the planned quantity is complete. Correct Answer: C
Correct Answer: C Explanation: A defensible professional decision should be based on current evidence and
Explanation: The selected action best supports safe, compliant, and technically sound applicable criteria. The other choices rely on assumption, remove safeguards, or change
performance because it addresses Pollution prevention, MARPOL principles and conditions before the cause is understood.
environmental protection using observable evidence rather than convenience.
14. The vessel approaches a traffic or pilotage constraint. Under these
5. An enclosed-space task is proposed without a completed entry check. Which conditions, when should the issue involving Collision avoidance, maneuvering,
troubleshooting approach is most appropriate for Pollution prevention? pilotage and restricted-water operations be escalated?
A. Stop or control the operation, protect personnel and follow the required emergency A. Rely on one electronic source when independent information conflicts.
or pollution-response procedure. B. Cross-check position, traffic and navigation sources before altering the passage
B. Depart with required safety equipment unavailable because conditions are calm. plan.
C. Continue the transfer until the planned quantity is complete. C. Make a series of small course changes that are difficult to detect.
D. Enter an enclosed space based only on a prior atmosphere test. D. Continue on an uncertain position until the next scheduled fix.
Correct Answer: A Correct Answer: B
Explanation: A defensible professional decision should be based on current evidence and Explanation: This is the most appropriate option because it connects the observed
applicable criteria. The other choices rely on assumption, remove safeguards, or change condition to the governing requirement and leaves a record of why the decision was made.
conditions before the cause is understood.
15. A position fix disagrees with the expected track. Which comparison is most
6. An engineering watch observes an abnormal temperature or pressure. Which useful for interpreting Collision avoidance?
action best supports a defensible decision about MARPOL principles? A. Assume there is no risk because the other vessel is visually small.
A. Contain and report a pollution risk using the required onboard response and B. Continue on an uncertain position until the next scheduled fix.
documentation process. C. Rely on one electronic source when independent information conflicts.
B. Discharge a small contaminant amount rather than initiating the response procedure. D. Review bearing/range trend, own-ship course/speed, target aspect and applicable
C. Make an unverified ballast change solely to improve trim. rule and compare the findings with the applicable criteria.
D. Depart with required safety equipment inoperative because the voyage is short. Correct Answer: D
Correct Answer: A Explanation: The correct choice follows a verify-act-confirm sequence. That is more
Explanation: This is the most appropriate option because it connects the observed reliable than bypassing controls or making multiple uncontrolled changes.
condition to the governing requirement and leaves a record of why the decision was made.
16. A navigation fix does not agree with another available source; the vessel
7. Required lifesaving equipment is not ready before departure. A change draft increases after cargo loading. Which action best distinguishes the
affecting environmental protection is being considered. How should it be handled? underlying cause from a symptom in restricted-water operations?
A. Stop or control the operation, protect personnel and follow the required emergency A. Verify the loading and stability data before accepting a cargo or ballast change,
or pollution-response procedure. then confirm that the corrective action is effective before closure.
B. Continue the transfer until the planned quantity is complete. B. Make an unverified ballast change solely to improve trim.
C. Depart with required safety equipment unavailable because conditions are calm. C. Depart with required safety equipment inoperative because the voyage is short.
D. Wash a small spill overboard rather than initiating the response process. D. Discharge a small contaminant amount rather than initiating the response procedure.
Correct Answer: A Correct Answer: A
Explanation: The correct choice follows a verify-act-confirm sequence. That is more Explanation: The strongest exam-style response is the one that controls immediate risk,
reliable than bypassing controls or making multiple uncontrolled changes. checks the relevant condition, and then acts within the defined requirements for
restricted-water operations.
8. The vessel approaches a traffic or pilotage constraint; visibility falls below
one nautical mile. The abnormal condition directly affects STCW competence, 17. Another vessel remains on nearly constant bearing while range decreases.
drills, records and professional watchkeeping standards. What is the most Which response is most consistent with the professional or compliance
appropriate response? requirements governing Navigation rules, watchkeeping responsibilities and bridge
A. Make a series of small course changes that are difficult to detect. resource management?
B. Rely on one electronic source when independent information conflicts. A. Continue on an uncertain position until the next scheduled fix.
C. Assume there is no risk because the other vessel is visually small. B. Assume there is no risk because the other vessel is visually small.
D. Cross-check position, traffic and navigation sources before altering the passage C. Make a series of small course changes that are difficult to detect.
plan. D. Use all available means to determine collision risk and take early, substantial
Correct Answer: D action consistent with the applicable navigation rules.
Explanation: The strongest exam-style response is the one that controls immediate risk, Correct Answer: D
checks the relevant condition, and then acts within the defined requirements for STCW Explanation: The correct response protects the integrity of the process: establish the
competence, drills, records and professional watchkeeping standards. facts, apply the appropriate control, and verify the result before closure.
9. An alarm occurs during machinery operation. Which documentation approach best 18. A position fix disagrees with the expected track. Which handoff practice best
supports traceability for STCW competence? reduces error risk for Navigation rules?
A. Silence a machinery alarm and continue at the same load without investigation. A. Record the observed condition, supporting evidence, decision and responsible
B. Use a single navigation source after another source shows a material discrepancy. follow-up; communicate any unresolved risk to the next responsible person.
C. Record the observed condition, supporting evidence, decision and responsible B. Rely on one electronic source when independent information conflicts.
follow-up; communicate any unresolved risk to the next responsible person. C. Make a series of small course changes that are difficult to detect.
D. Assume constant bearing is harmless when range is decreasing. D. Continue on an uncertain position until the next scheduled fix.
Correct Answer: C Correct Answer: A
Explanation: The correct response protects the integrity of the process: establish the Explanation: This approach preserves control of the situation while producing evidence
facts, apply the appropriate control, and verify the result before closure. that can confirm whether the action actually corrected the issue involving Navigation
rules.
1
,USCG Master or Chief Mate Offshore Supply Vessel Exam | Practice Exam Q&A
19. A position fix disagrees with the expected track. Which decision about 28. Ballast is proposed to correct a list; a navigation fix differs by 0.8
watchkeeping responsibilities is best supported by the available evidence? nautical mile from another source. The abnormal condition directly affects basic
A. Assume there is no risk because the other vessel is visually small. stability calculations. What is the most appropriate response?
B. Continue on an uncertain position until the next scheduled fix. A. Ignore slack-tank effects because total liquid weight is unchanged.
C. Rely on one electronic source when independent information conflicts. B. Account for free-surface and weight-shift effects when evaluating stability and
D. Use all available means to determine collision risk and take early, substantial trim.
action consistent with the applicable navigation rules. C. Accept a loading condition based only on even draft readings.
Correct Answer: D D. Correct a list by moving weight without checking stability impact.
Explanation: This answer uses verified evidence before action, which reduces the chance Correct Answer: B
of masking the real problem and supports a traceable decision about watchkeeping Explanation: The selected action best supports safe, compliant, and technically sound
responsibilities. performance because it addresses basic stability calculations using observable evidence
rather than convenience.
20. A vessel must plan a passage through constrained waters; visibility falls
below one nautical mile. Which review step adds the most value before closing 29. Cargo loading changes the vessel's vertical center of gravity. Which
work involving bridge resource management? documentation approach best supports traceability for Cargo operations, stowage,
A. Depart with required safety equipment inoperative because the voyage is short. securing and hazards relevant to vessel type?
B. Discharge a small contaminant amount rather than initiating the response procedure. A. Move heavy cargo higher to free lower deck space without recalculation.
C. Verify the loading and stability data before accepting a cargo or ballast change, B. Record the observed condition, supporting evidence, decision and responsible
then confirm that the corrective action is effective before closure. follow-up; communicate any unresolved risk to the next responsible person.
D. Make an unverified ballast change solely to improve trim. C. Correct a list by moving weight without checking stability impact.
Correct Answer: C D. Ignore slack-tank effects because total liquid weight is unchanged.
Explanation: The selected action best supports safe, compliant, and technically sound Correct Answer: B
performance because it addresses bridge resource management using observable evidence Explanation: A defensible professional decision should be based on current evidence and
rather than convenience. applicable criteria. The other choices rely on assumption, remove safeguards, or change
conditions before the cause is understood.
21. A deck watch detects a change in bearing to another vessel. With respect to
Chartwork, publications, voyage planning and position fixing, what is the best 30. A deck load is shifted to a higher position. Which action is most likely to
FIRST action? prevent recurrence of a problem involving Cargo operations?
A. Silence a machinery alarm and continue at the same load without investigation. A. Accept a loading condition based only on even draft readings.
B. Use a single navigation source after another source shows a material discrepancy. B. Ignore slack-tank effects because total liquid weight is unchanged.
C. Assume constant bearing is harmless when range is decreasing. C. Move heavy cargo higher to free lower deck space without recalculation.
D. Respond to an abnormal machinery indication by protecting the plant, confirming the D. Account for free-surface and weight-shift effects when evaluating stability and
indication and following the operating procedure. trim, then confirm that the corrective action is effective before closure.
Correct Answer: D Correct Answer: D
Explanation: A defensible professional decision should be based on current evidence and Explanation: This is the most appropriate option because it connects the observed
applicable criteria. The other choices rely on assumption, remove safeguards, or change condition to the governing requirement and leaves a record of why the decision was made.
conditions before the cause is understood.
31. An engineering watch observes an abnormal temperature or pressure. Which
22. A vessel must plan a passage through constrained waters. Which evidence is sequence is most appropriate when carrying out hazards relevant to vessel type?
most important when evaluating voyage planning? A. Use a single navigation source after another source shows a material discrepancy.
A. Review stability data, loading condition and free-surface effects and compare the B. Assume constant bearing is harmless when range is decreasing.
findings with the applicable criteria. C. Use all available means to assess collision risk and take early, substantial action
B. Make an unverified ballast change solely to improve trim. consistent with the applicable navigation rules, then verify the resulting state
C. Depart with required safety equipment inoperative because the voyage is short. before moving to the next step.
D. Discharge a small contaminant amount rather than initiating the response procedure. D. Silence a machinery alarm and continue at the same load without investigation.
Correct Answer: A Correct Answer: C
Explanation: This is the most appropriate option because it connects the observed Explanation: The correct choice follows a verify-act-confirm sequence. That is more
condition to the governing requirement and leaves a record of why the decision was made. reliable than bypassing controls or making multiple uncontrolled changes.
23. A vessel approaches restricted visibility with traffic nearby. Which response 32. An electrical protective device trips repeatedly; a target bearing remains
best controls the primary risk associated with position fixing? nearly constant as range decreases. Which choice demonstrates the strongest
A. Respond to an abnormal machinery indication by protecting the plant, confirming the control of Marine engineering or electrical systems applicable to the named
indication and following the operating procedure. officer/module?
B. Assume constant bearing is harmless when range is decreasing. A. Compare operating pressures/temperatures, equipment status and recent changes to
C. Silence a machinery alarm and continue at the same load without investigation. isolate the fault safely.
D. Use a single navigation source after another source shows a material discrepancy. B. Increase machinery load to see whether the abnormal indication clears.
Correct Answer: A C. Make several plant changes simultaneously before recording the original condition.
Explanation: The correct choice follows a verify-act-confirm sequence. That is more D. Reset a protective trip repeatedly without finding the cause.
reliable than bypassing controls or making multiple uncontrolled changes. Correct Answer: A
Explanation: The strongest exam-style response is the one that controls immediate risk,
24. The vessel approaches a traffic or pilotage constraint; a target bearing
checks the relevant condition, and then acts within the defined requirements for Marine
remains nearly constant as range decreases. Before proceeding with work involving
engineering or electrical systems applicable to the named officer/module.
Meteorology, tides, currents and environmental conditions affecting safe
navigation, what should be verified? 33. A pump loses discharge pressure while demand remains constant. What is
A. Make a series of small course changes that are difficult to detect. required before accepting the result related to Marine engineering?
B. Review position sources, charted hazards, depth/under-keel clearance and traffic A. Review pressure, temperature, lubrication, electrical load, alarm history and
and compare the findings with the applicable criteria. equipment status and compare the findings with the applicable criteria.
C. Rely on one electronic source when independent information conflicts. B. Disable an alarm that is interrupting operations.
D. Assume there is no risk because the other vessel is visually small. C. Reset a protective trip repeatedly without finding the cause.
Correct Answer: B D. Increase machinery load to see whether the abnormal indication clears.
Explanation: The strongest exam-style response is the one that controls immediate risk, Correct Answer: A
checks the relevant condition, and then acts within the defined requirements for Explanation: The correct response protects the integrity of the process: establish the
Meteorology, tides, currents and environmental conditions affecting safe navigation. facts, apply the appropriate control, and verify the result before closure.
25. Another vessel remains on nearly constant bearing while range decreases. 34. A vessel approaches restricted visibility with traffic nearby. Under these
Which troubleshooting approach is most appropriate for environmental conditions conditions, when should the issue involving electrical systems applicable to the
affecting safe navigation? named officer/module be escalated?
A. Use all available means to determine collision risk and take early, substantial A. Contain and report a pollution risk using the required onboard response and
action consistent with the applicable navigation rules. documentation process.
B. Continue on an uncertain position until the next scheduled fix. B. Make an unverified ballast change solely to improve trim.
C. Assume there is no risk because the other vessel is visually small. C. Depart with required safety equipment inoperative because the voyage is short.
D. Make a series of small course changes that are difficult to detect. D. Discharge a small contaminant amount rather than initiating the response procedure.
Correct Answer: A Correct Answer: A
Explanation: The correct response protects the integrity of the process: establish the Explanation: This approach preserves control of the situation while producing evidence
facts, apply the appropriate control, and verify the result before closure. that can confirm whether the action actually corrected the issue involving electrical
systems applicable to the named officer/module.
26. Ballast is proposed to correct a list. Which action best supports a
defensible decision about Ship stability, trim, loading and basic stability 35. A pollution-prevention barrier is found compromised during transfer. Which
calculations? comparison is most useful for interpreting Pollution prevention, MARPOL
A. Accept a loading condition based only on even draft readings. principles and environmental protection?
B. Account for free-surface and weight-shift effects when evaluating stability and A. Continue the transfer until the planned quantity is complete.
trim. B. Review source/quantity of release, containment condition, notifications and
C. Ignore slack-tank effects because total liquid weight is unchanged. response equipment and compare the findings with the applicable criteria.
D. Move heavy cargo higher to free lower deck space without recalculation. C. Depart with required safety equipment unavailable because conditions are calm.
Correct Answer: B D. Wash a small spill overboard rather than initiating the response process.
Explanation: This approach preserves control of the situation while producing evidence Correct Answer: B
that can confirm whether the action actually corrected the issue involving Ship Explanation: This answer uses verified evidence before action, which reduces the chance
stability, trim, loading and basic stability calculations. of masking the real problem and supports a traceable decision about Pollution
prevention, MARPOL principles and environmental protection.
27. A slack tank creates additional free-surface effect. A change affecting Ship
stability is being considered. How should it be handled? 36. Required lifesaving equipment is not ready before departure; a machinery
A. Correct a list by moving weight without checking stability impact. temperature rises 20 C above its normal trend. Which action best distinguishes
B. Move heavy cargo higher to free lower deck space without recalculation. the underlying cause from a symptom in Pollution prevention?
C. Recalculate the relevant stability condition before accepting the loading or A. Correct a required safety-equipment deficiency and verify readiness before
ballast change. proceeding, then confirm that the corrective action is effective before closure.
D. Accept a loading condition based only on even draft readings. B. Enter an enclosed space based only on a prior atmosphere test.
Correct Answer: C C. Wash a small spill overboard rather than initiating the response process.
Explanation: This answer uses verified evidence before action, which reduces the chance D. Continue the transfer until the planned quantity is complete.
of masking the real problem and supports a traceable decision about Ship stability. Correct Answer: A
Explanation: The selected action best supports safe, compliant, and technically sound
performance because it addresses Pollution prevention using observable evidence rather
than convenience.
2
, USCG Master or Chief Mate Offshore Supply Vessel Exam | Practice Exam Q&A
37. A pre-departure check identifies a safety-equipment deficiency. Which 46. Visibility falls and several targets appear on radar. Which action best
response is most consistent with the professional or compliance requirements supports a defensible decision about Collision avoidance?
governing MARPOL principles? A. Rely on one electronic source when independent information conflicts.
A. Use a single navigation source after another source shows a material discrepancy. B. Cross-check position, traffic and navigation sources before altering the passage
B. Assume constant bearing is harmless when range is decreasing. plan.
C. Silence a machinery alarm and continue at the same load without investigation. C. Make a series of small course changes that are difficult to detect.
D. Respond to an abnormal machinery indication by protecting the plant, confirming the D. Continue on an uncertain position until the next scheduled fix.
indication and following the operating procedure. Correct Answer: B
Correct Answer: D Explanation: This is the most appropriate option because it connects the observed
Explanation: A defensible professional decision should be based on current evidence and condition to the governing requirement and leaves a record of why the decision was made.
applicable criteria. The other choices rely on assumption, remove safeguards, or change
conditions before the cause is understood.
47. A pollution-prevention control is compromised during operations. A change
affecting restricted-water operations is being considered. How should it be
38. A pollution-prevention barrier is found compromised during transfer. Which handled?
handoff practice best reduces error risk for environmental protection? A. Assume constant bearing is harmless when range is decreasing.
A. Record the observed condition, supporting evidence, decision and responsible B. Silence a machinery alarm and continue at the same load without investigation.
follow-up; communicate any unresolved risk to the next responsible person. C. Respond to an abnormal machinery indication by protecting the plant, confirming the
B. Wash a small spill overboard rather than initiating the response process. indication and following the operating procedure.
C. Enter an enclosed space based only on a prior atmosphere test. D. Use a single navigation source after another source shows a material discrepancy.
D. Depart with required safety equipment unavailable because conditions are calm. Correct Answer: C
Correct Answer: A Explanation: The correct choice follows a verify-act-confirm sequence. That is more
Explanation: This is the most appropriate option because it connects the observed reliable than bypassing controls or making multiple uncontrolled changes.
condition to the governing requirement and leaves a record of why the decision was made.
48. The vessel approaches a traffic or pilotage constraint; a navigation fix
39. A position fix disagrees with the expected track. Which decision about STCW differs by 0.8 nautical mile from another source. The abnormal condition directly
competence, drills, records and professional watchkeeping standards is best affects Navigation rules, watchkeeping responsibilities and bridge resource
supported by the available evidence? management. What is the most appropriate response?
A. Assume there is no risk because the other vessel is visually small. A. Make a series of small course changes that are difficult to detect.
B. Continue on an uncertain position until the next scheduled fix. B. Rely on one electronic source when independent information conflicts.
C. Rely on one electronic source when independent information conflicts. C. Cross-check position, traffic and navigation sources before altering the passage
D. Use all available means to determine collision risk and take early, substantial plan.
action consistent with the applicable navigation rules. D. Assume there is no risk because the other vessel is visually small.
Correct Answer: D Correct Answer: C
Explanation: The correct choice follows a verify-act-confirm sequence. That is more Explanation: The strongest exam-style response is the one that controls immediate risk,
reliable than bypassing controls or making multiple uncontrolled changes. checks the relevant condition, and then acts within the defined requirements for
Navigation rules, watchkeeping responsibilities and bridge resource management.
40. A towing or deck operation is affected by changing weather; a machinery
temperature rises 20 C above its normal trend. Which review step adds the most 49. Visibility falls and several targets appear on radar. Which documentation
value before closing work involving STCW competence? approach best supports traceability for Navigation rules?
A. Make an unverified ballast change solely to improve trim. A. Continue on an uncertain position until the next scheduled fix.
B. Depart with required safety equipment inoperative because the voyage is short. B. Assume there is no risk because the other vessel is visually small.
C. Verify the loading and stability data before accepting a cargo or ballast change, C. Record the observed condition, supporting evidence, decision and responsible
then confirm that the corrective action is effective before closure. follow-up; communicate any unresolved risk to the next responsible person.
D. Discharge a small contaminant amount rather than initiating the response procedure. D. Make a series of small course changes that are difficult to detect.
Correct Answer: C Correct Answer: C
Explanation: The strongest exam-style response is the one that controls immediate risk, Explanation: The correct response protects the integrity of the process: establish the
checks the relevant condition, and then acts within the defined requirements for STCW facts, apply the appropriate control, and verify the result before closure.
competence.
50. Visibility falls and several targets appear on radar. Which action is most
41. Visibility falls and several targets appear on radar. With respect to likely to prevent recurrence of a problem involving watchkeeping
professional watchkeeping standards, what is the best FIRST action? responsibilities?
A. Continue on an uncertain position until the next scheduled fix. A. Rely on one electronic source when independent information conflicts.
B. Assume there is no risk because the other vessel is visually small. B. Make a series of small course changes that are difficult to detect.
C. Use all available means to determine collision risk and take early, substantial C. Continue on an uncertain position until the next scheduled fix.
action consistent with the applicable navigation rules. D. Cross-check position, traffic and navigation sources before altering the passage
D. Make a series of small course changes that are difficult to detect. plan, then confirm that the corrective action is effective before closure.
Correct Answer: C Correct Answer: D
Explanation: The correct response protects the integrity of the process: establish the Explanation: This approach preserves control of the situation while producing evidence
facts, apply the appropriate control, and verify the result before closure. that can confirm whether the action actually corrected the issue involving watchkeeping
responsibilities.
42. A towing or deck operation is affected by changing weather. Which evidence is
most important when evaluating Communications, GMDSS awareness and 51. An alarm occurs during machinery operation. Which sequence is most
distress/urgency procedures? appropriate when carrying out bridge resource management?
A. Review pollution-prevention requirements and the condition of containment systems A. Silence a machinery alarm and continue at the same load without investigation.
and compare the findings with the applicable criteria. B. Respond to an abnormal machinery indication by protecting the plant, confirming the
B. Discharge a small contaminant amount rather than initiating the response procedure. indication and following the operating procedure, then verify the resulting state
C. Make an unverified ballast change solely to improve trim. before moving to the next step.
D. Depart with required safety equipment inoperative because the voyage is short. C. Use a single navigation source after another source shows a material discrepancy.
Correct Answer: A D. Assume constant bearing is harmless when range is decreasing.
Explanation: This approach preserves control of the situation while producing evidence Correct Answer: B
that can confirm whether the action actually corrected the issue involving Explanation: This answer uses verified evidence before action, which reduces the chance
Communications, GMDSS awareness and distress/urgency procedures. of masking the real problem and supports a traceable decision about bridge resource
management.
43. A deck watch detects a change in bearing to another vessel. Which response
best controls the primary risk associated with GMDSS awareness? 52. A stability calculation is required after cargo or ballast changes; a
A. Respond to an abnormal machinery indication by protecting the plant, confirming the machinery temperature rises 20 C above its normal trend. Which choice
indication and following the operating procedure. demonstrates the strongest control of Chartwork, publications, voyage planning
B. Use a single navigation source after another source shows a material discrepancy. and position fixing?
C. Assume constant bearing is harmless when range is decreasing. A. Contain and report a pollution risk using the required onboard response and
D. Silence a machinery alarm and continue at the same load without investigation. documentation process.
Correct Answer: A B. Make an unverified ballast change solely to improve trim.
Explanation: This answer uses verified evidence before action, which reduces the chance C. Depart with required safety equipment inoperative because the voyage is short.
of masking the real problem and supports a traceable decision about GMDSS awareness. D. Discharge a small contaminant amount rather than initiating the response procedure.
Correct Answer: A
44. A navigation fix does not agree with another available source; the vessel
Explanation: The selected action best supports safe, compliant, and technically sound
draft increases after cargo loading. Before proceeding with work involving
performance because it addresses Chartwork, publications, voyage planning and position
distress/urgency procedures, what should be verified? fixing using observable evidence rather than convenience.
A. Depart with required safety equipment inoperative because the voyage is short.
B. Discharge a small contaminant amount rather than initiating the response procedure. 53. An alarm occurs during machinery operation. What is required before accepting
C. Make an unverified ballast change solely to improve trim. the result related to voyage planning?
D. Review required safety equipment and readiness before departure and compare the A. Assume constant bearing is harmless when range is decreasing.
findings with the applicable criteria. B. Silence a machinery alarm and continue at the same load without investigation.
Correct Answer: D C. Use a single navigation source after another source shows a material discrepancy.
Explanation: The selected action best supports safe, compliant, and technically sound D. Review position, course, speed, traffic and applicable navigation rules and compare
performance because it addresses distress/urgency procedures using observable evidence the findings with the applicable criteria.
rather than convenience. Correct Answer: D
Explanation: A defensible professional decision should be based on current evidence and
45. A position fix disagrees with the expected track. Which troubleshooting
applicable criteria. The other choices rely on assumption, remove safeguards, or change
approach is most appropriate for Collision avoidance, maneuvering, pilotage and conditions before the cause is understood.
restricted-water operations?
A. Continue on an uncertain position until the next scheduled fix. 54. A deck watch detects a change in bearing to another vessel. Under these
B. Use all available means to determine collision risk and take early, substantial conditions, when should the issue involving position fixing be escalated?
action consistent with the applicable navigation rules. A. Contain and report a pollution risk using the required onboard response and
C. Assume there is no risk because the other vessel is visually small. documentation process.
D. Make a series of small course changes that are difficult to detect. B. Discharge a small contaminant amount rather than initiating the response procedure.
Correct Answer: B C. Make an unverified ballast change solely to improve trim.
Explanation: A defensible professional decision should be based on current evidence and D. Depart with required safety equipment inoperative because the voyage is short.
applicable criteria. The other choices rely on assumption, remove safeguards, or change Correct Answer: A
conditions before the cause is understood. Explanation: This is the most appropriate option because it connects the observed
condition to the governing requirement and leaves a record of why the decision was made.
3
Vessel Exam | Practice Exam Q&A
ID14105
,USCG Master or Chief Mate Offshore Supply Vessel Exam | Practice Exam Q&A
1. An alarm appears after a change in plant configuration. With respect to Marine 10. A position fix disagrees with the expected track. Which action is most likely
engineering or electrical systems applicable to the named officer/module, what is to prevent recurrence of a problem involving professional watchkeeping standards?
the best FIRST action? A. Rely on one electronic source when independent information conflicts.
A. Disable an alarm that is interrupting operations. B. Make a series of small course changes that are difficult to detect.
B. Reset a protective trip repeatedly without finding the cause. C. Cross-check position, traffic and navigation sources before altering the passage
C. Increase machinery load to see whether the abnormal indication clears. plan, then confirm that the corrective action is effective before closure.
D. Protect the plant, verify the indication and diagnose the affected system before D. Continue on an uncertain position until the next scheduled fix.
resetting or increasing load. Correct Answer: C
Correct Answer: D Explanation: This approach preserves control of the situation while producing evidence
Explanation: The correct response protects the integrity of the process: establish the that can confirm whether the action actually corrected the issue involving professional
facts, apply the appropriate control, and verify the result before closure. watchkeeping standards.
2. An electrical protective device trips repeatedly. Which evidence is most 11. An alarm occurs during machinery operation. Which sequence is most
important when evaluating Marine engineering? appropriate when carrying out Communications, GMDSS awareness and
A. Review protective-device indication, circuit condition and recent configuration distress/urgency procedures?
change and compare the findings with the applicable criteria. A. Assume constant bearing is harmless when range is decreasing.
B. Make several plant changes simultaneously before recording the original condition. B. Cross-check navigation sources and resolve a position discrepancy before relying on
C. Increase machinery load to see whether the abnormal indication clears. the fix, then verify the resulting state before moving to the next step.
D. Disable an alarm that is interrupting operations. C. Silence a machinery alarm and continue at the same load without investigation.
Correct Answer: A D. Use a single navigation source after another source shows a material discrepancy.
Explanation: This approach preserves control of the situation while producing evidence Correct Answer: B
that can confirm whether the action actually corrected the issue involving Marine Explanation: This answer uses verified evidence before action, which reduces the chance
engineering. of masking the real problem and supports a traceable decision about Communications,
GMDSS awareness and distress/urgency procedures.
3. A pollution-prevention control is compromised during operations. Which
response best controls the primary risk associated with electrical systems 12. A vessel approaches restricted visibility with traffic nearby; visibility
applicable to the named officer/module? falls below one nautical mile. Which choice demonstrates the strongest control of
A. Silence a machinery alarm and continue at the same load without investigation. GMDSS awareness?
B. Respond to an abnormal machinery indication by protecting the plant, confirming the A. Discharge a small contaminant amount rather than initiating the response procedure.
indication and following the operating procedure. B. Make an unverified ballast change solely to improve trim.
C. Use a single navigation source after another source shows a material discrepancy. C. Contain and report a pollution risk using the required onboard response and
D. Assume constant bearing is harmless when range is decreasing. documentation process.
Correct Answer: B D. Depart with required safety equipment inoperative because the voyage is short.
Explanation: This answer uses verified evidence before action, which reduces the chance Correct Answer: C
of masking the real problem and supports a traceable decision about electrical systems Explanation: The selected action best supports safe, compliant, and technically sound
applicable to the named officer/module. performance because it addresses GMDSS awareness using observable evidence rather than
convenience.
4. Required lifesaving equipment is not ready before departure; a target bearing
remains nearly constant as range decreases. Before proceeding with work involving 13. A towing or deck operation is affected by changing weather. What is required
Pollution prevention, MARPOL principles and environmental protection, what should before accepting the result related to distress/urgency procedures?
be verified? A. Use a single navigation source after another source shows a material discrepancy.
A. Enter an enclosed space based only on a prior atmosphere test. B. Assume constant bearing is harmless when range is decreasing.
B. Wash a small spill overboard rather than initiating the response process. C. Review weather, tide/current, under-keel clearance and route hazards and compare
C. Review equipment inventory, inspection status and operational readiness and compare the findings with the applicable criteria.
the findings with the applicable criteria. D. Silence a machinery alarm and continue at the same load without investigation.
D. Continue the transfer until the planned quantity is complete. Correct Answer: C
Correct Answer: C Explanation: A defensible professional decision should be based on current evidence and
Explanation: The selected action best supports safe, compliant, and technically sound applicable criteria. The other choices rely on assumption, remove safeguards, or change
performance because it addresses Pollution prevention, MARPOL principles and conditions before the cause is understood.
environmental protection using observable evidence rather than convenience.
14. The vessel approaches a traffic or pilotage constraint. Under these
5. An enclosed-space task is proposed without a completed entry check. Which conditions, when should the issue involving Collision avoidance, maneuvering,
troubleshooting approach is most appropriate for Pollution prevention? pilotage and restricted-water operations be escalated?
A. Stop or control the operation, protect personnel and follow the required emergency A. Rely on one electronic source when independent information conflicts.
or pollution-response procedure. B. Cross-check position, traffic and navigation sources before altering the passage
B. Depart with required safety equipment unavailable because conditions are calm. plan.
C. Continue the transfer until the planned quantity is complete. C. Make a series of small course changes that are difficult to detect.
D. Enter an enclosed space based only on a prior atmosphere test. D. Continue on an uncertain position until the next scheduled fix.
Correct Answer: A Correct Answer: B
Explanation: A defensible professional decision should be based on current evidence and Explanation: This is the most appropriate option because it connects the observed
applicable criteria. The other choices rely on assumption, remove safeguards, or change condition to the governing requirement and leaves a record of why the decision was made.
conditions before the cause is understood.
15. A position fix disagrees with the expected track. Which comparison is most
6. An engineering watch observes an abnormal temperature or pressure. Which useful for interpreting Collision avoidance?
action best supports a defensible decision about MARPOL principles? A. Assume there is no risk because the other vessel is visually small.
A. Contain and report a pollution risk using the required onboard response and B. Continue on an uncertain position until the next scheduled fix.
documentation process. C. Rely on one electronic source when independent information conflicts.
B. Discharge a small contaminant amount rather than initiating the response procedure. D. Review bearing/range trend, own-ship course/speed, target aspect and applicable
C. Make an unverified ballast change solely to improve trim. rule and compare the findings with the applicable criteria.
D. Depart with required safety equipment inoperative because the voyage is short. Correct Answer: D
Correct Answer: A Explanation: The correct choice follows a verify-act-confirm sequence. That is more
Explanation: This is the most appropriate option because it connects the observed reliable than bypassing controls or making multiple uncontrolled changes.
condition to the governing requirement and leaves a record of why the decision was made.
16. A navigation fix does not agree with another available source; the vessel
7. Required lifesaving equipment is not ready before departure. A change draft increases after cargo loading. Which action best distinguishes the
affecting environmental protection is being considered. How should it be handled? underlying cause from a symptom in restricted-water operations?
A. Stop or control the operation, protect personnel and follow the required emergency A. Verify the loading and stability data before accepting a cargo or ballast change,
or pollution-response procedure. then confirm that the corrective action is effective before closure.
B. Continue the transfer until the planned quantity is complete. B. Make an unverified ballast change solely to improve trim.
C. Depart with required safety equipment unavailable because conditions are calm. C. Depart with required safety equipment inoperative because the voyage is short.
D. Wash a small spill overboard rather than initiating the response process. D. Discharge a small contaminant amount rather than initiating the response procedure.
Correct Answer: A Correct Answer: A
Explanation: The correct choice follows a verify-act-confirm sequence. That is more Explanation: The strongest exam-style response is the one that controls immediate risk,
reliable than bypassing controls or making multiple uncontrolled changes. checks the relevant condition, and then acts within the defined requirements for
restricted-water operations.
8. The vessel approaches a traffic or pilotage constraint; visibility falls below
one nautical mile. The abnormal condition directly affects STCW competence, 17. Another vessel remains on nearly constant bearing while range decreases.
drills, records and professional watchkeeping standards. What is the most Which response is most consistent with the professional or compliance
appropriate response? requirements governing Navigation rules, watchkeeping responsibilities and bridge
A. Make a series of small course changes that are difficult to detect. resource management?
B. Rely on one electronic source when independent information conflicts. A. Continue on an uncertain position until the next scheduled fix.
C. Assume there is no risk because the other vessel is visually small. B. Assume there is no risk because the other vessel is visually small.
D. Cross-check position, traffic and navigation sources before altering the passage C. Make a series of small course changes that are difficult to detect.
plan. D. Use all available means to determine collision risk and take early, substantial
Correct Answer: D action consistent with the applicable navigation rules.
Explanation: The strongest exam-style response is the one that controls immediate risk, Correct Answer: D
checks the relevant condition, and then acts within the defined requirements for STCW Explanation: The correct response protects the integrity of the process: establish the
competence, drills, records and professional watchkeeping standards. facts, apply the appropriate control, and verify the result before closure.
9. An alarm occurs during machinery operation. Which documentation approach best 18. A position fix disagrees with the expected track. Which handoff practice best
supports traceability for STCW competence? reduces error risk for Navigation rules?
A. Silence a machinery alarm and continue at the same load without investigation. A. Record the observed condition, supporting evidence, decision and responsible
B. Use a single navigation source after another source shows a material discrepancy. follow-up; communicate any unresolved risk to the next responsible person.
C. Record the observed condition, supporting evidence, decision and responsible B. Rely on one electronic source when independent information conflicts.
follow-up; communicate any unresolved risk to the next responsible person. C. Make a series of small course changes that are difficult to detect.
D. Assume constant bearing is harmless when range is decreasing. D. Continue on an uncertain position until the next scheduled fix.
Correct Answer: C Correct Answer: A
Explanation: The correct response protects the integrity of the process: establish the Explanation: This approach preserves control of the situation while producing evidence
facts, apply the appropriate control, and verify the result before closure. that can confirm whether the action actually corrected the issue involving Navigation
rules.
1
,USCG Master or Chief Mate Offshore Supply Vessel Exam | Practice Exam Q&A
19. A position fix disagrees with the expected track. Which decision about 28. Ballast is proposed to correct a list; a navigation fix differs by 0.8
watchkeeping responsibilities is best supported by the available evidence? nautical mile from another source. The abnormal condition directly affects basic
A. Assume there is no risk because the other vessel is visually small. stability calculations. What is the most appropriate response?
B. Continue on an uncertain position until the next scheduled fix. A. Ignore slack-tank effects because total liquid weight is unchanged.
C. Rely on one electronic source when independent information conflicts. B. Account for free-surface and weight-shift effects when evaluating stability and
D. Use all available means to determine collision risk and take early, substantial trim.
action consistent with the applicable navigation rules. C. Accept a loading condition based only on even draft readings.
Correct Answer: D D. Correct a list by moving weight without checking stability impact.
Explanation: This answer uses verified evidence before action, which reduces the chance Correct Answer: B
of masking the real problem and supports a traceable decision about watchkeeping Explanation: The selected action best supports safe, compliant, and technically sound
responsibilities. performance because it addresses basic stability calculations using observable evidence
rather than convenience.
20. A vessel must plan a passage through constrained waters; visibility falls
below one nautical mile. Which review step adds the most value before closing 29. Cargo loading changes the vessel's vertical center of gravity. Which
work involving bridge resource management? documentation approach best supports traceability for Cargo operations, stowage,
A. Depart with required safety equipment inoperative because the voyage is short. securing and hazards relevant to vessel type?
B. Discharge a small contaminant amount rather than initiating the response procedure. A. Move heavy cargo higher to free lower deck space without recalculation.
C. Verify the loading and stability data before accepting a cargo or ballast change, B. Record the observed condition, supporting evidence, decision and responsible
then confirm that the corrective action is effective before closure. follow-up; communicate any unresolved risk to the next responsible person.
D. Make an unverified ballast change solely to improve trim. C. Correct a list by moving weight without checking stability impact.
Correct Answer: C D. Ignore slack-tank effects because total liquid weight is unchanged.
Explanation: The selected action best supports safe, compliant, and technically sound Correct Answer: B
performance because it addresses bridge resource management using observable evidence Explanation: A defensible professional decision should be based on current evidence and
rather than convenience. applicable criteria. The other choices rely on assumption, remove safeguards, or change
conditions before the cause is understood.
21. A deck watch detects a change in bearing to another vessel. With respect to
Chartwork, publications, voyage planning and position fixing, what is the best 30. A deck load is shifted to a higher position. Which action is most likely to
FIRST action? prevent recurrence of a problem involving Cargo operations?
A. Silence a machinery alarm and continue at the same load without investigation. A. Accept a loading condition based only on even draft readings.
B. Use a single navigation source after another source shows a material discrepancy. B. Ignore slack-tank effects because total liquid weight is unchanged.
C. Assume constant bearing is harmless when range is decreasing. C. Move heavy cargo higher to free lower deck space without recalculation.
D. Respond to an abnormal machinery indication by protecting the plant, confirming the D. Account for free-surface and weight-shift effects when evaluating stability and
indication and following the operating procedure. trim, then confirm that the corrective action is effective before closure.
Correct Answer: D Correct Answer: D
Explanation: A defensible professional decision should be based on current evidence and Explanation: This is the most appropriate option because it connects the observed
applicable criteria. The other choices rely on assumption, remove safeguards, or change condition to the governing requirement and leaves a record of why the decision was made.
conditions before the cause is understood.
31. An engineering watch observes an abnormal temperature or pressure. Which
22. A vessel must plan a passage through constrained waters. Which evidence is sequence is most appropriate when carrying out hazards relevant to vessel type?
most important when evaluating voyage planning? A. Use a single navigation source after another source shows a material discrepancy.
A. Review stability data, loading condition and free-surface effects and compare the B. Assume constant bearing is harmless when range is decreasing.
findings with the applicable criteria. C. Use all available means to assess collision risk and take early, substantial action
B. Make an unverified ballast change solely to improve trim. consistent with the applicable navigation rules, then verify the resulting state
C. Depart with required safety equipment inoperative because the voyage is short. before moving to the next step.
D. Discharge a small contaminant amount rather than initiating the response procedure. D. Silence a machinery alarm and continue at the same load without investigation.
Correct Answer: A Correct Answer: C
Explanation: This is the most appropriate option because it connects the observed Explanation: The correct choice follows a verify-act-confirm sequence. That is more
condition to the governing requirement and leaves a record of why the decision was made. reliable than bypassing controls or making multiple uncontrolled changes.
23. A vessel approaches restricted visibility with traffic nearby. Which response 32. An electrical protective device trips repeatedly; a target bearing remains
best controls the primary risk associated with position fixing? nearly constant as range decreases. Which choice demonstrates the strongest
A. Respond to an abnormal machinery indication by protecting the plant, confirming the control of Marine engineering or electrical systems applicable to the named
indication and following the operating procedure. officer/module?
B. Assume constant bearing is harmless when range is decreasing. A. Compare operating pressures/temperatures, equipment status and recent changes to
C. Silence a machinery alarm and continue at the same load without investigation. isolate the fault safely.
D. Use a single navigation source after another source shows a material discrepancy. B. Increase machinery load to see whether the abnormal indication clears.
Correct Answer: A C. Make several plant changes simultaneously before recording the original condition.
Explanation: The correct choice follows a verify-act-confirm sequence. That is more D. Reset a protective trip repeatedly without finding the cause.
reliable than bypassing controls or making multiple uncontrolled changes. Correct Answer: A
Explanation: The strongest exam-style response is the one that controls immediate risk,
24. The vessel approaches a traffic or pilotage constraint; a target bearing
checks the relevant condition, and then acts within the defined requirements for Marine
remains nearly constant as range decreases. Before proceeding with work involving
engineering or electrical systems applicable to the named officer/module.
Meteorology, tides, currents and environmental conditions affecting safe
navigation, what should be verified? 33. A pump loses discharge pressure while demand remains constant. What is
A. Make a series of small course changes that are difficult to detect. required before accepting the result related to Marine engineering?
B. Review position sources, charted hazards, depth/under-keel clearance and traffic A. Review pressure, temperature, lubrication, electrical load, alarm history and
and compare the findings with the applicable criteria. equipment status and compare the findings with the applicable criteria.
C. Rely on one electronic source when independent information conflicts. B. Disable an alarm that is interrupting operations.
D. Assume there is no risk because the other vessel is visually small. C. Reset a protective trip repeatedly without finding the cause.
Correct Answer: B D. Increase machinery load to see whether the abnormal indication clears.
Explanation: The strongest exam-style response is the one that controls immediate risk, Correct Answer: A
checks the relevant condition, and then acts within the defined requirements for Explanation: The correct response protects the integrity of the process: establish the
Meteorology, tides, currents and environmental conditions affecting safe navigation. facts, apply the appropriate control, and verify the result before closure.
25. Another vessel remains on nearly constant bearing while range decreases. 34. A vessel approaches restricted visibility with traffic nearby. Under these
Which troubleshooting approach is most appropriate for environmental conditions conditions, when should the issue involving electrical systems applicable to the
affecting safe navigation? named officer/module be escalated?
A. Use all available means to determine collision risk and take early, substantial A. Contain and report a pollution risk using the required onboard response and
action consistent with the applicable navigation rules. documentation process.
B. Continue on an uncertain position until the next scheduled fix. B. Make an unverified ballast change solely to improve trim.
C. Assume there is no risk because the other vessel is visually small. C. Depart with required safety equipment inoperative because the voyage is short.
D. Make a series of small course changes that are difficult to detect. D. Discharge a small contaminant amount rather than initiating the response procedure.
Correct Answer: A Correct Answer: A
Explanation: The correct response protects the integrity of the process: establish the Explanation: This approach preserves control of the situation while producing evidence
facts, apply the appropriate control, and verify the result before closure. that can confirm whether the action actually corrected the issue involving electrical
systems applicable to the named officer/module.
26. Ballast is proposed to correct a list. Which action best supports a
defensible decision about Ship stability, trim, loading and basic stability 35. A pollution-prevention barrier is found compromised during transfer. Which
calculations? comparison is most useful for interpreting Pollution prevention, MARPOL
A. Accept a loading condition based only on even draft readings. principles and environmental protection?
B. Account for free-surface and weight-shift effects when evaluating stability and A. Continue the transfer until the planned quantity is complete.
trim. B. Review source/quantity of release, containment condition, notifications and
C. Ignore slack-tank effects because total liquid weight is unchanged. response equipment and compare the findings with the applicable criteria.
D. Move heavy cargo higher to free lower deck space without recalculation. C. Depart with required safety equipment unavailable because conditions are calm.
Correct Answer: B D. Wash a small spill overboard rather than initiating the response process.
Explanation: This approach preserves control of the situation while producing evidence Correct Answer: B
that can confirm whether the action actually corrected the issue involving Ship Explanation: This answer uses verified evidence before action, which reduces the chance
stability, trim, loading and basic stability calculations. of masking the real problem and supports a traceable decision about Pollution
prevention, MARPOL principles and environmental protection.
27. A slack tank creates additional free-surface effect. A change affecting Ship
stability is being considered. How should it be handled? 36. Required lifesaving equipment is not ready before departure; a machinery
A. Correct a list by moving weight without checking stability impact. temperature rises 20 C above its normal trend. Which action best distinguishes
B. Move heavy cargo higher to free lower deck space without recalculation. the underlying cause from a symptom in Pollution prevention?
C. Recalculate the relevant stability condition before accepting the loading or A. Correct a required safety-equipment deficiency and verify readiness before
ballast change. proceeding, then confirm that the corrective action is effective before closure.
D. Accept a loading condition based only on even draft readings. B. Enter an enclosed space based only on a prior atmosphere test.
Correct Answer: C C. Wash a small spill overboard rather than initiating the response process.
Explanation: This answer uses verified evidence before action, which reduces the chance D. Continue the transfer until the planned quantity is complete.
of masking the real problem and supports a traceable decision about Ship stability. Correct Answer: A
Explanation: The selected action best supports safe, compliant, and technically sound
performance because it addresses Pollution prevention using observable evidence rather
than convenience.
2
, USCG Master or Chief Mate Offshore Supply Vessel Exam | Practice Exam Q&A
37. A pre-departure check identifies a safety-equipment deficiency. Which 46. Visibility falls and several targets appear on radar. Which action best
response is most consistent with the professional or compliance requirements supports a defensible decision about Collision avoidance?
governing MARPOL principles? A. Rely on one electronic source when independent information conflicts.
A. Use a single navigation source after another source shows a material discrepancy. B. Cross-check position, traffic and navigation sources before altering the passage
B. Assume constant bearing is harmless when range is decreasing. plan.
C. Silence a machinery alarm and continue at the same load without investigation. C. Make a series of small course changes that are difficult to detect.
D. Respond to an abnormal machinery indication by protecting the plant, confirming the D. Continue on an uncertain position until the next scheduled fix.
indication and following the operating procedure. Correct Answer: B
Correct Answer: D Explanation: This is the most appropriate option because it connects the observed
Explanation: A defensible professional decision should be based on current evidence and condition to the governing requirement and leaves a record of why the decision was made.
applicable criteria. The other choices rely on assumption, remove safeguards, or change
conditions before the cause is understood.
47. A pollution-prevention control is compromised during operations. A change
affecting restricted-water operations is being considered. How should it be
38. A pollution-prevention barrier is found compromised during transfer. Which handled?
handoff practice best reduces error risk for environmental protection? A. Assume constant bearing is harmless when range is decreasing.
A. Record the observed condition, supporting evidence, decision and responsible B. Silence a machinery alarm and continue at the same load without investigation.
follow-up; communicate any unresolved risk to the next responsible person. C. Respond to an abnormal machinery indication by protecting the plant, confirming the
B. Wash a small spill overboard rather than initiating the response process. indication and following the operating procedure.
C. Enter an enclosed space based only on a prior atmosphere test. D. Use a single navigation source after another source shows a material discrepancy.
D. Depart with required safety equipment unavailable because conditions are calm. Correct Answer: C
Correct Answer: A Explanation: The correct choice follows a verify-act-confirm sequence. That is more
Explanation: This is the most appropriate option because it connects the observed reliable than bypassing controls or making multiple uncontrolled changes.
condition to the governing requirement and leaves a record of why the decision was made.
48. The vessel approaches a traffic or pilotage constraint; a navigation fix
39. A position fix disagrees with the expected track. Which decision about STCW differs by 0.8 nautical mile from another source. The abnormal condition directly
competence, drills, records and professional watchkeeping standards is best affects Navigation rules, watchkeeping responsibilities and bridge resource
supported by the available evidence? management. What is the most appropriate response?
A. Assume there is no risk because the other vessel is visually small. A. Make a series of small course changes that are difficult to detect.
B. Continue on an uncertain position until the next scheduled fix. B. Rely on one electronic source when independent information conflicts.
C. Rely on one electronic source when independent information conflicts. C. Cross-check position, traffic and navigation sources before altering the passage
D. Use all available means to determine collision risk and take early, substantial plan.
action consistent with the applicable navigation rules. D. Assume there is no risk because the other vessel is visually small.
Correct Answer: D Correct Answer: C
Explanation: The correct choice follows a verify-act-confirm sequence. That is more Explanation: The strongest exam-style response is the one that controls immediate risk,
reliable than bypassing controls or making multiple uncontrolled changes. checks the relevant condition, and then acts within the defined requirements for
Navigation rules, watchkeeping responsibilities and bridge resource management.
40. A towing or deck operation is affected by changing weather; a machinery
temperature rises 20 C above its normal trend. Which review step adds the most 49. Visibility falls and several targets appear on radar. Which documentation
value before closing work involving STCW competence? approach best supports traceability for Navigation rules?
A. Make an unverified ballast change solely to improve trim. A. Continue on an uncertain position until the next scheduled fix.
B. Depart with required safety equipment inoperative because the voyage is short. B. Assume there is no risk because the other vessel is visually small.
C. Verify the loading and stability data before accepting a cargo or ballast change, C. Record the observed condition, supporting evidence, decision and responsible
then confirm that the corrective action is effective before closure. follow-up; communicate any unresolved risk to the next responsible person.
D. Discharge a small contaminant amount rather than initiating the response procedure. D. Make a series of small course changes that are difficult to detect.
Correct Answer: C Correct Answer: C
Explanation: The strongest exam-style response is the one that controls immediate risk, Explanation: The correct response protects the integrity of the process: establish the
checks the relevant condition, and then acts within the defined requirements for STCW facts, apply the appropriate control, and verify the result before closure.
competence.
50. Visibility falls and several targets appear on radar. Which action is most
41. Visibility falls and several targets appear on radar. With respect to likely to prevent recurrence of a problem involving watchkeeping
professional watchkeeping standards, what is the best FIRST action? responsibilities?
A. Continue on an uncertain position until the next scheduled fix. A. Rely on one electronic source when independent information conflicts.
B. Assume there is no risk because the other vessel is visually small. B. Make a series of small course changes that are difficult to detect.
C. Use all available means to determine collision risk and take early, substantial C. Continue on an uncertain position until the next scheduled fix.
action consistent with the applicable navigation rules. D. Cross-check position, traffic and navigation sources before altering the passage
D. Make a series of small course changes that are difficult to detect. plan, then confirm that the corrective action is effective before closure.
Correct Answer: C Correct Answer: D
Explanation: The correct response protects the integrity of the process: establish the Explanation: This approach preserves control of the situation while producing evidence
facts, apply the appropriate control, and verify the result before closure. that can confirm whether the action actually corrected the issue involving watchkeeping
responsibilities.
42. A towing or deck operation is affected by changing weather. Which evidence is
most important when evaluating Communications, GMDSS awareness and 51. An alarm occurs during machinery operation. Which sequence is most
distress/urgency procedures? appropriate when carrying out bridge resource management?
A. Review pollution-prevention requirements and the condition of containment systems A. Silence a machinery alarm and continue at the same load without investigation.
and compare the findings with the applicable criteria. B. Respond to an abnormal machinery indication by protecting the plant, confirming the
B. Discharge a small contaminant amount rather than initiating the response procedure. indication and following the operating procedure, then verify the resulting state
C. Make an unverified ballast change solely to improve trim. before moving to the next step.
D. Depart with required safety equipment inoperative because the voyage is short. C. Use a single navigation source after another source shows a material discrepancy.
Correct Answer: A D. Assume constant bearing is harmless when range is decreasing.
Explanation: This approach preserves control of the situation while producing evidence Correct Answer: B
that can confirm whether the action actually corrected the issue involving Explanation: This answer uses verified evidence before action, which reduces the chance
Communications, GMDSS awareness and distress/urgency procedures. of masking the real problem and supports a traceable decision about bridge resource
management.
43. A deck watch detects a change in bearing to another vessel. Which response
best controls the primary risk associated with GMDSS awareness? 52. A stability calculation is required after cargo or ballast changes; a
A. Respond to an abnormal machinery indication by protecting the plant, confirming the machinery temperature rises 20 C above its normal trend. Which choice
indication and following the operating procedure. demonstrates the strongest control of Chartwork, publications, voyage planning
B. Use a single navigation source after another source shows a material discrepancy. and position fixing?
C. Assume constant bearing is harmless when range is decreasing. A. Contain and report a pollution risk using the required onboard response and
D. Silence a machinery alarm and continue at the same load without investigation. documentation process.
Correct Answer: A B. Make an unverified ballast change solely to improve trim.
Explanation: This answer uses verified evidence before action, which reduces the chance C. Depart with required safety equipment inoperative because the voyage is short.
of masking the real problem and supports a traceable decision about GMDSS awareness. D. Discharge a small contaminant amount rather than initiating the response procedure.
Correct Answer: A
44. A navigation fix does not agree with another available source; the vessel
Explanation: The selected action best supports safe, compliant, and technically sound
draft increases after cargo loading. Before proceeding with work involving
performance because it addresses Chartwork, publications, voyage planning and position
distress/urgency procedures, what should be verified? fixing using observable evidence rather than convenience.
A. Depart with required safety equipment inoperative because the voyage is short.
B. Discharge a small contaminant amount rather than initiating the response procedure. 53. An alarm occurs during machinery operation. What is required before accepting
C. Make an unverified ballast change solely to improve trim. the result related to voyage planning?
D. Review required safety equipment and readiness before departure and compare the A. Assume constant bearing is harmless when range is decreasing.
findings with the applicable criteria. B. Silence a machinery alarm and continue at the same load without investigation.
Correct Answer: D C. Use a single navigation source after another source shows a material discrepancy.
Explanation: The selected action best supports safe, compliant, and technically sound D. Review position, course, speed, traffic and applicable navigation rules and compare
performance because it addresses distress/urgency procedures using observable evidence the findings with the applicable criteria.
rather than convenience. Correct Answer: D
Explanation: A defensible professional decision should be based on current evidence and
45. A position fix disagrees with the expected track. Which troubleshooting
applicable criteria. The other choices rely on assumption, remove safeguards, or change
approach is most appropriate for Collision avoidance, maneuvering, pilotage and conditions before the cause is understood.
restricted-water operations?
A. Continue on an uncertain position until the next scheduled fix. 54. A deck watch detects a change in bearing to another vessel. Under these
B. Use all available means to determine collision risk and take early, substantial conditions, when should the issue involving position fixing be escalated?
action consistent with the applicable navigation rules. A. Contain and report a pollution risk using the required onboard response and
C. Assume there is no risk because the other vessel is visually small. documentation process.
D. Make a series of small course changes that are difficult to detect. B. Discharge a small contaminant amount rather than initiating the response procedure.
Correct Answer: B C. Make an unverified ballast change solely to improve trim.
Explanation: A defensible professional decision should be based on current evidence and D. Depart with required safety equipment inoperative because the voyage is short.
applicable criteria. The other choices rely on assumption, remove safeguards, or change Correct Answer: A
conditions before the cause is understood. Explanation: This is the most appropriate option because it connects the observed
condition to the governing requirement and leaves a record of why the decision was made.
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