USCG Merchant Mariner Credential Exam General
Subjects I | Practice Exam Q&A
ID14112
,USCG Merchant Mariner Credential Exam General Subjects I | Practice Exam Q&A
1. The vessel approaches a traffic or pilotage constraint. With respect to STCW 10. Another vessel remains on nearly constant bearing while range decreases.
competence, drills, records and professional watchkeeping standards, what is the Which action is most likely to prevent recurrence of a problem involving
best FIRST action? Navigation rules, watchkeeping responsibilities and bridge resource management?
A. Make a series of small course changes that are difficult to detect. A. Cross-check position, traffic and navigation sources before altering the passage
B. Rely on one electronic source when independent information conflicts. plan, then confirm that the corrective action is effective before closure.
C. Cross-check position, traffic and navigation sources before altering the passage B. Continue on an uncertain position until the next scheduled fix.
plan. C. Assume there is no risk because the other vessel is visually small.
D. Continue on an uncertain position until the next scheduled fix. D. Rely on one electronic source when independent information conflicts.
Correct Answer: C Correct Answer: A
Explanation: The selected action best supports safe, compliant, and technically sound Explanation: A defensible professional decision should be based on current evidence and
performance because it addresses STCW competence, drills, records and professional applicable criteria. The other choices rely on assumption, remove safeguards, or change
watchkeeping standards using observable evidence rather than convenience. conditions before the cause is understood.
2. An alarm occurs during machinery operation. Which evidence is most important 11. A position fix disagrees with the expected track. Which sequence is most
when evaluating STCW competence? appropriate when carrying out Navigation rules?
A. Use a single navigation source after another source shows a material discrepancy. A. Rely on one electronic source when independent information conflicts.
B. Review weather, tide/current, under-keel clearance and route hazards and compare B. Make a series of small course changes that are difficult to detect.
the findings with the applicable criteria. C. Cross-check position, traffic and navigation sources before altering the passage
C. Assume constant bearing is harmless when range is decreasing. plan, then verify the resulting state before moving to the next step.
D. Silence a machinery alarm and continue at the same load without investigation. D. Assume there is no risk because the other vessel is visually small.
Correct Answer: B Correct Answer: C
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.
12. A position fix disagrees with the expected track; a target bearing remains
3. A position fix disagrees with the expected track. Which response best controls nearly constant as range decreases. Which choice demonstrates the strongest
the primary risk associated with professional watchkeeping standards? control of watchkeeping responsibilities?
A. Rely on one electronic source when independent information conflicts. A. Use all available means to determine collision risk and take early, substantial
B. Make a series of small course changes that are difficult to detect. action consistent with the applicable navigation rules.
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. Continue on an uncertain position until the next scheduled fix.
plan. D. Make a series of small course changes that are difficult to detect.
Correct Answer: D Correct Answer: A
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.
4. An alarm occurs during machinery operation; a target bearing remains nearly 13. A vessel must plan a passage through constrained waters. What is required
constant as range decreases. Before proceeding with work involving before accepting the result related to bridge resource management?
Communications, GMDSS awareness and distress/urgency procedures, what should be A. Review pollution-prevention requirements and the condition of containment systems
verified? and compare the findings with the applicable criteria.
A. Silence a machinery alarm and continue at the same load without investigation. B. Discharge a small contaminant amount rather than initiating the response procedure.
B. Review machinery pressures, temperatures, alarms and operating limits and compare C. Make an unverified ballast change solely to improve trim.
the findings with the applicable criteria. 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: The strongest exam-style response is the one that controls immediate risk,
Correct Answer: B checks the relevant condition, and then acts within the defined requirements for bridge
Explanation: The correct choice follows a verify-act-confirm sequence. That is more resource management.
reliable than bypassing controls or making multiple uncontrolled changes.
14. A deck watch detects a change in bearing to another vessel. Under these
5. A vessel approaches restricted visibility with traffic nearby. Which conditions, when should the issue involving Chartwork, publications, voyage
troubleshooting approach is most appropriate for GMDSS awareness? planning and position fixing be escalated?
A. Make an unverified ballast change solely to improve trim. A. Use a single navigation source after another source shows a material discrepancy.
B. Depart with required safety equipment inoperative because the voyage is short. B. Use all available means to assess collision risk and take early, substantial action
C. Correct a required safety-equipment deficiency before sailing when the vessel consistent with the applicable navigation rules.
cannot legally or safely depart. C. Assume constant bearing is harmless when range is decreasing.
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: C Correct Answer: B
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 GMDSS facts, apply the appropriate control, and verify the result before closure.
awareness.
15. A vessel must plan a passage through constrained waters. Which comparison is
6. A towing or deck operation is affected by changing weather. Which action best most useful for interpreting voyage planning?
supports a defensible decision about distress/urgency procedures? A. 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. B. Depart with required safety equipment inoperative because the voyage is short.
C. Use all available means to assess collision risk and take early, substantial action C. Discharge a small contaminant amount rather than initiating the response procedure.
consistent with the applicable navigation rules. D. Make an unverified ballast change solely to improve trim.
D. Use a single navigation source after another source shows a material discrepancy. Correct Answer: A
Correct Answer: C 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 voyage
facts, apply the appropriate control, and verify the result before closure. planning.
7. The vessel approaches a traffic or pilotage constraint. A change affecting 16. A vessel approaches restricted visibility with traffic nearby; visibility
Collision avoidance, maneuvering, pilotage and restricted-water operations is falls below one nautical mile. Which action best distinguishes the underlying
being considered. How should it be handled? cause from a symptom in position fixing?
A. Rely on one electronic source when independent information conflicts. A. Verify the loading and stability data before accepting a cargo or ballast change,
B. Make a series of small course changes that are difficult to detect. then confirm that the corrective action is effective before closure.
C. Assume there is no risk because the other vessel is visually small. B. Silence a machinery alarm and continue at the same load without investigation.
D. Cross-check position, traffic and navigation sources before altering the passage C. Use a single navigation source after another source shows a material discrepancy.
plan. D. Assume constant bearing is harmless when range is decreasing.
Correct Answer: D Correct Answer: A
Explanation: This approach preserves control of the situation while producing evidence Explanation: This answer uses verified evidence before action, which reduces the chance
that can confirm whether the action actually corrected the issue involving Collision of masking the real problem and supports a traceable decision about position fixing.
avoidance, maneuvering, pilotage and restricted-water operations.
17. The vessel approaches a traffic or pilotage constraint. Which response is
8. A position fix disagrees with the expected track; visibility falls below one most consistent with the professional or compliance requirements governing
nautical mile. The abnormal condition directly affects Collision avoidance. What Meteorology, tides, currents and environmental conditions affecting safe
is the most appropriate response? navigation?
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. 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 C. Rely on one electronic source when independent information conflicts.
action consistent with the applicable navigation rules. D. Continue on an uncertain position until the next scheduled fix.
Correct Answer: D Correct Answer: B
Explanation: This answer uses verified evidence before action, which reduces the chance Explanation: The selected action best supports safe, compliant, and technically sound
of masking the real problem and supports a traceable decision about Collision avoidance. performance because it addresses Meteorology, tides, currents and environmental
conditions affecting safe navigation using observable evidence rather than convenience.
9. A navigation fix does not agree with another available source. Which
documentation approach best supports traceability for restricted-water 18. Another vessel remains on nearly constant bearing while range decreases.
operations? Which handoff practice best reduces error risk for environmental conditions
A. Record the observed condition, supporting evidence, decision and responsible affecting safe navigation?
follow-up; communicate any unresolved risk to the next responsible person. 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. Discharge a small contaminant amount rather than initiating the response procedure. C. Rely on one electronic source when independent information conflicts.
D. Make an unverified ballast change solely to improve trim. D. Record the observed condition, supporting evidence, decision and responsible
Correct Answer: A follow-up; communicate any unresolved risk to the next responsible person.
Explanation: The selected action best supports safe, compliant, and technically sound Correct Answer: D
performance because it addresses restricted-water operations 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.
1
,USCG Merchant Mariner Credential Exam General Subjects I | Practice Exam Q&A
19. Ballast is proposed to correct a list. Which decision about Ship stability, 28. A spill occurs during machinery or cargo operations; visibility falls below
trim, loading and basic stability calculations is best supported by the available one nautical mile. The abnormal condition directly affects emergency procedures.
evidence? What is the most appropriate response?
A. Accept a loading condition based only on even draft readings. A. Stop or control the operation, protect personnel and follow the required emergency
B. Ignore slack-tank effects because total liquid weight is unchanged. or pollution-response procedure.
C. Correct a list by moving weight without checking stability impact. B. Continue the transfer until the planned quantity is complete.
D. Account for free-surface and weight-shift effects when evaluating stability and C. Depart with required safety equipment unavailable because conditions are calm.
trim. D. Enter an enclosed space based only on a prior atmosphere test.
Correct Answer: D Correct Answer: A
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.
20. A slack tank creates additional free-surface effect; a navigation fix differs 29. A pump loses discharge pressure while demand remains constant. Which
by 0.8 nautical mile from another source. Which review step adds the most value documentation approach best supports traceability for Fire prevention,
before closing work involving Ship stability? firefighting, damage control and abandonment procedures?
A. Correct a list by moving weight without checking stability impact. A. Increase machinery load to see whether the abnormal indication clears.
B. Account for free-surface and weight-shift effects when evaluating stability and B. Record the observed condition, supporting evidence, decision and responsible
trim, then confirm that the corrective action is effective before closure. follow-up; communicate any unresolved risk to the next responsible person.
C. Move heavy cargo higher to free lower deck space without recalculation. C. Make several plant changes simultaneously before recording the original condition.
D. Ignore slack-tank effects because total liquid weight is unchanged. D. Disable an alarm that is interrupting operations.
Correct Answer: B Correct Answer: B
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 Fire
prevention, firefighting, damage control and abandonment procedures.
21. Ballast is proposed to correct a list. With respect to basic stability
calculations, what is the best FIRST action? 30. A stability calculation is required after cargo or ballast changes. Which
A. Ignore slack-tank effects because total liquid weight is unchanged. action is most likely to prevent recurrence of a problem involving Fire
B. Account for free-surface and weight-shift effects when evaluating stability and prevention?
trim. A. Verify the loading and stability data before accepting a cargo or ballast change,
C. Accept a loading condition based only on even draft readings. then confirm that the corrective action is effective before closure.
D. Move heavy cargo higher to free lower deck space without recalculation. B. Assume constant bearing is harmless when range is decreasing.
Correct Answer: B C. Silence a machinery alarm and continue at the same load without investigation.
Explanation: The strongest exam-style response is the one that controls immediate risk, D. Use a single navigation source after another source shows a material discrepancy.
checks the relevant condition, and then acts within the defined requirements for basic Correct Answer: A
stability calculations. Explanation: The correct response protects the integrity of the process: establish the
facts, apply the appropriate control, and verify the result before closure.
22. Cargo loading changes the vessel's vertical center of gravity. Which evidence
is most important when evaluating Cargo operations, stowage, securing and hazards 31. An alarm appears after a change in plant configuration. Which sequence is
relevant to vessel type? most appropriate when carrying out damage control?
A. Move heavy cargo higher to free lower deck space without recalculation. A. Make several plant changes simultaneously before recording the original condition.
B. Correct a list by moving weight without checking stability impact. B. Increase machinery load to see whether the abnormal indication clears.
C. Accept a loading condition based only on even draft readings. C. Reset a protective trip repeatedly without finding the cause.
D. Review displacement, weight location, GM/stability data and tank condition and D. Compare operating pressures/temperatures, equipment status and recent changes to
compare the findings with the applicable criteria. isolate the fault safely, then verify the resulting state before moving to the next
Correct Answer: D step.
Explanation: The correct response protects the integrity of the process: establish the Correct Answer: D
facts, apply the appropriate control, and verify the result before closure. Explanation: This approach preserves control of the situation while producing evidence
that can confirm whether the action actually corrected the issue involving damage
23. A deck load is shifted to a higher position. Which response best controls the control.
primary risk associated with Cargo operations?
A. Accept a loading condition based only on even draft readings. 32. A pollution-prevention control is compromised during operations; a navigation
B. Ignore slack-tank effects because total liquid weight is unchanged. fix differs by 0.8 nautical mile from another source. Which choice demonstrates
C. Correct a list by moving weight without checking stability impact. the strongest control of abandonment procedures?
D. Account for free-surface and weight-shift effects when evaluating stability and A. Use a single navigation source after another source shows a material discrepancy.
trim. B. Use all available means to assess collision risk and take early, substantial action
Correct Answer: D consistent with the applicable navigation rules.
Explanation: This approach preserves control of the situation while producing evidence C. Assume constant bearing is harmless when range is decreasing.
that can confirm whether the action actually corrected the issue involving Cargo D. Silence a machinery alarm and continue at the same load without investigation.
operations. Correct Answer: B
Explanation: This answer uses verified evidence before action, which reduces the chance
24. An engineering watch observes an abnormal temperature or pressure; the vessel
of masking the real problem and supports a traceable decision about abandonment
draft increases after cargo loading. Before proceeding with work involving procedures.
hazards relevant to vessel type, what should be verified?
A. Review position, course, speed, traffic and applicable navigation rules and compare 33. The vessel approaches a traffic or pilotage constraint. What is required
the findings with the applicable criteria. before accepting the result related to STCW competence, drills, records and
B. Assume constant bearing is harmless when range is decreasing. professional watchkeeping standards?
C. Silence a machinery alarm and continue at the same load without investigation. A. Make a series of small course changes that are difficult to detect.
D. Use a single navigation source after another source shows a material discrepancy. B. Rely on one electronic source when independent information conflicts.
Correct Answer: A C. Review position sources, charted hazards, depth/under-keel clearance and traffic
Explanation: This answer uses verified evidence before action, which reduces the chance and compare the findings with the applicable criteria.
of masking the real problem and supports a traceable decision about hazards relevant to D. Continue on an uncertain position until the next scheduled fix.
vessel type. Correct Answer: C
Explanation: The selected action best supports safe, compliant, and technically sound
25. A spill occurs during machinery or cargo operations. Which troubleshooting
performance because it addresses STCW competence, drills, records and professional
approach is most appropriate for Marine safety systems, lifesaving appliances and watchkeeping standards using observable evidence rather than convenience.
emergency procedures?
A. Enter an enclosed space based only on a prior atmosphere test. 34. A navigation fix does not agree with another available source. Under these
B. Wash a small spill overboard rather than initiating the response process. conditions, when should the issue involving STCW competence be escalated?
C. Correct a required safety-equipment deficiency and verify readiness before A. Silence a machinery alarm and continue at the same load without investigation.
proceeding. B. Use a single navigation source after another source shows a material discrepancy.
D. Depart with required safety equipment unavailable because conditions are calm. C. Use all available means to assess collision risk and take early, substantial action
Correct Answer: C consistent with the applicable navigation rules.
Explanation: The selected action best supports safe, compliant, and technically sound D. Assume constant bearing is harmless when range is decreasing.
performance because it addresses Marine safety systems, lifesaving appliances and Correct Answer: C
emergency procedures using observable evidence rather than convenience. Explanation: A defensible professional decision should be based on current evidence and
applicable criteria. The other choices rely on assumption, remove safeguards, or change
26. An enclosed-space task is proposed without a completed entry check. Which conditions before the cause is understood.
action best supports a defensible decision about Marine safety systems?
A. Depart with required safety equipment unavailable because conditions are calm. 35. A position fix disagrees with the expected track. Which comparison is most
B. Continue the transfer until the planned quantity is complete. useful for interpreting professional watchkeeping standards?
C. Stop or control the operation, protect personnel and follow the required emergency A. Review position sources, charted hazards, depth/under-keel clearance and traffic
or pollution-response procedure. and compare the findings with the applicable criteria.
D. Wash a small spill overboard rather than initiating the response process. B. Rely on one electronic source when independent information conflicts.
Correct Answer: C C. Make a series of small course changes that are difficult to detect.
Explanation: A defensible professional decision should be based on current evidence and D. Assume there is no risk because the other vessel is visually small.
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.
27. A deck watch detects a change in bearing to another vessel. A change
affecting lifesaving appliances is being considered. How should it be handled? 36. A navigation fix does not agree with another available source; the vessel
A. Correct a required safety-equipment deficiency before sailing when the vessel draft increases after cargo loading. Which action best distinguishes the
cannot legally or safely depart. underlying cause from a symptom in Communications, GMDSS awareness and
B. Depart with required safety equipment inoperative because the voyage is short. distress/urgency procedures?
C. Discharge a small contaminant amount rather than initiating the response procedure. A. Assume constant bearing is harmless when range is decreasing.
D. Make an unverified ballast change solely to improve trim. B. Silence a machinery alarm and continue at the same load without investigation.
Correct Answer: A C. Use a single navigation source after another source shows a material discrepancy.
Explanation: This is the most appropriate option because it connects the observed D. Verify the loading and stability data before accepting a cargo or ballast change,
condition to the governing requirement and leaves a record of why the decision was made. then confirm that the corrective action is effective before closure.
Correct Answer: D
Explanation: The correct choice follows a verify-act-confirm sequence. That is more
reliable than bypassing controls or making multiple uncontrolled changes.
2
, USCG Merchant Mariner Credential Exam General Subjects I | Practice Exam Q&A
37. A stability calculation is required after cargo or ballast changes. Which 46. An engineering watch observes an abnormal temperature or pressure. Which
response is most consistent with the professional or compliance requirements action best supports a defensible decision about Chartwork, publications, voyage
governing GMDSS awareness? planning and position fixing?
A. Discharge a small contaminant amount rather than initiating the response procedure. A. Silence a machinery alarm and continue at the same load without investigation.
B. Make an unverified ballast change solely to improve trim. B. Use a single navigation source after another source shows a material discrepancy.
C. Depart with required safety equipment inoperative because the voyage is short. C. Use all available means to assess collision risk and take early, substantial action
D. Correct a required safety-equipment deficiency before sailing when the vessel consistent with the applicable navigation rules.
cannot legally or safely depart. D. Assume constant bearing is harmless when range is decreasing.
Correct Answer: D 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 GMDSS facts, apply the appropriate control, and verify the result before closure.
awareness.
47. A towing or deck operation is affected by changing weather. A change
38. A pollution-prevention control is compromised during operations. Which affecting voyage planning is being considered. How should it be handled?
handoff practice best reduces error risk for distress/urgency procedures? A. Make an unverified ballast change solely to improve trim.
A. Use a single navigation source after another source shows a material discrepancy. B. Depart with required safety equipment inoperative because the voyage is short.
B. Record the observed condition, supporting evidence, decision and responsible C. Correct a required safety-equipment deficiency before sailing when the vessel
follow-up; communicate any unresolved risk to the next responsible person. cannot legally or safely depart.
C. Assume constant bearing is harmless when range is decreasing. 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: C
Correct Answer: B 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 voyage
facts, apply the appropriate control, and verify the result before closure. planning.
39. The vessel approaches a traffic or pilotage constraint. Which decision about 48. A stability calculation is required after cargo or ballast changes; a
Collision avoidance, maneuvering, pilotage and restricted-water operations is machinery temperature rises 20 C above its normal trend. The abnormal condition
best supported by the available evidence? directly affects position fixing. What is the most appropriate response?
A. Cross-check position, traffic and navigation sources before altering the passage A. Assume constant bearing is harmless when range is decreasing.
plan. B. Silence a machinery alarm and continue at the same load without investigation.
B. Rely on one electronic source when independent information conflicts. C. Use a single navigation source after another source shows a material discrepancy.
C. Make a series of small course changes that are difficult to detect. D. Use all available means to assess collision risk and take early, substantial action
D. Assume there is no risk because the other vessel is visually small. consistent with the applicable navigation rules.
Correct Answer: A Correct Answer: D
Explanation: This approach preserves control of the situation while producing evidence Explanation: This answer uses verified evidence before action, which reduces the chance
that can confirm whether the action actually corrected the issue involving Collision of masking the real problem and supports a traceable decision about position fixing.
avoidance, maneuvering, pilotage and restricted-water operations.
49. The vessel approaches a traffic or pilotage constraint. Which documentation
40. A position fix disagrees with the expected track; a machinery temperature approach best supports traceability for Meteorology, tides, currents and
rises 20 C above its normal trend. Which review step adds the most value before environmental conditions affecting safe navigation?
closing work involving Collision avoidance? A. Make a series of small course changes that are difficult to detect.
A. Assume there is no risk because the other vessel is visually small. B. Rely on one electronic source when independent information conflicts.
B. Continue on an uncertain position until the next scheduled fix. C. Record the observed condition, supporting evidence, decision and responsible
C. Make a series of small course changes that are difficult to detect. follow-up; communicate any unresolved risk to the next responsible person.
D. Cross-check position, traffic and navigation sources before altering the passage D. Continue on an uncertain position until the next scheduled fix.
plan, then confirm that the corrective action is effective before closure. Correct Answer: C
Correct Answer: D Explanation: The selected action best supports safe, compliant, and technically sound
Explanation: This answer uses verified evidence before action, which reduces the chance performance because it addresses Meteorology, tides, currents and environmental
of masking the real problem and supports a traceable decision about Collision avoidance. conditions affecting safe navigation using observable evidence rather than convenience.
41. A vessel approaches restricted visibility with traffic nearby. With respect 50. Another vessel remains on nearly constant bearing while range decreases.
to restricted-water operations, what is the best FIRST action? Which action is most likely to prevent recurrence of a problem involving
A. Make an unverified ballast change solely to improve trim. environmental conditions affecting safe navigation?
B. Depart with required safety equipment inoperative because the voyage is short. A. Continue on an uncertain position until the next scheduled fix.
C. Correct a required safety-equipment deficiency before sailing when the vessel B. Cross-check position, traffic and navigation sources before altering the passage
cannot legally or safely depart. plan, then confirm that the corrective action is effective before closure.
D. Discharge a small contaminant amount rather than initiating the response procedure. C. Assume there is no risk because the other vessel is visually small.
Correct Answer: C D. Rely on one electronic source when independent information conflicts.
Explanation: The selected action best supports safe, compliant, and technically sound Correct Answer: B
performance because it addresses restricted-water operations 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.
42. Another vessel remains on nearly constant bearing while range decreases.
Which evidence is most important when evaluating Navigation rules, watchkeeping 51. Ballast is proposed to correct a list. Which sequence is most appropriate
responsibilities and bridge resource management? when carrying out Ship stability, trim, loading and basic stability calculations?
A. Continue on an uncertain position until the next scheduled fix. A. Account for free-surface and weight-shift effects when evaluating stability and
B. Review bearing/range trend, own-ship course/speed, target aspect and applicable trim, then verify the resulting state before moving to the next step.
rule and compare the findings with the applicable criteria. B. Accept a loading condition based only on even draft readings.
C. Assume there is no risk because the other vessel is visually small. C. Ignore slack-tank effects because total liquid weight is unchanged.
D. Rely on one electronic source when independent information conflicts. D. Correct a list by moving weight without checking stability impact.
Correct Answer: B Correct Answer: A
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.
52. A slack tank creates additional free-surface effect; a target bearing remains
43. A position fix disagrees with the expected track. Which response best nearly constant as range decreases. Which choice demonstrates the strongest
controls the primary risk associated with Navigation rules? control of Ship stability?
A. Rely on one electronic source when independent information conflicts. A. Recalculate the relevant stability condition before accepting the loading or
B. Make a series of small course changes that are difficult to detect. ballast change.
C. Assume there is no risk because the other vessel is visually small. B. Correct a list by moving weight without checking stability impact.
D. Cross-check position, traffic and navigation sources before altering the passage C. Move heavy cargo higher to free lower deck space without recalculation.
plan. D. Ignore slack-tank effects because total liquid weight is unchanged.
Correct Answer: D Correct Answer: A
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.
44. A position fix disagrees with the expected track; the vessel draft increases 53. Ballast is proposed to correct a list. What is required before accepting the
after cargo loading. Before proceeding with work involving watchkeeping result related to basic stability calculations?
responsibilities, what should be verified? A. Review loading manual limits, free-surface moment and resulting draft/trim and
A. Assume there is no risk because the other vessel is visually small. compare the findings with the applicable criteria.
B. Continue on an uncertain position until the next scheduled fix. B. Ignore slack-tank effects because total liquid weight is unchanged.
C. Make a series of small course changes that are difficult to detect. C. Accept a loading condition based only on even draft readings.
D. Review bearing/range trend, own-ship course/speed, target aspect and applicable D. Move heavy cargo higher to free lower deck space without recalculation.
rule and compare the findings with the applicable criteria. Correct Answer: A
Correct Answer: D Explanation: The strongest exam-style response is the one that controls immediate risk,
Explanation: The correct choice follows a verify-act-confirm sequence. That is more checks the relevant condition, and then acts within the defined requirements for basic
reliable than bypassing controls or making multiple uncontrolled changes. stability calculations.
45. A towing or deck operation is affected by changing weather. Which 54. Cargo loading changes the vessel's vertical center of gravity. Under these
troubleshooting approach is most appropriate for bridge resource management? conditions, when should the issue involving Cargo operations, stowage, securing
A. Correct a required safety-equipment deficiency before sailing when the vessel and hazards relevant to vessel type be escalated?
cannot legally or safely depart. A. Move heavy cargo higher to free lower deck space without recalculation.
B. Depart with required safety equipment inoperative because the voyage is short. B. Correct a list by moving weight without checking stability impact.
C. Discharge a small contaminant amount rather than initiating the response procedure. C. Recalculate the relevant stability condition before accepting the loading or
D. Make an unverified ballast change solely to improve trim. ballast change.
Correct Answer: A D. Accept a loading condition based only on even draft readings.
Explanation: The strongest exam-style response is the one that controls immediate risk, Correct Answer: C
checks the relevant condition, and then acts within the defined requirements for bridge Explanation: The correct response protects the integrity of the process: establish the
resource management. facts, apply the appropriate control, and verify the result before closure.
3
Subjects I | Practice Exam Q&A
ID14112
,USCG Merchant Mariner Credential Exam General Subjects I | Practice Exam Q&A
1. The vessel approaches a traffic or pilotage constraint. With respect to STCW 10. Another vessel remains on nearly constant bearing while range decreases.
competence, drills, records and professional watchkeeping standards, what is the Which action is most likely to prevent recurrence of a problem involving
best FIRST action? Navigation rules, watchkeeping responsibilities and bridge resource management?
A. Make a series of small course changes that are difficult to detect. A. Cross-check position, traffic and navigation sources before altering the passage
B. Rely on one electronic source when independent information conflicts. plan, then confirm that the corrective action is effective before closure.
C. Cross-check position, traffic and navigation sources before altering the passage B. Continue on an uncertain position until the next scheduled fix.
plan. C. Assume there is no risk because the other vessel is visually small.
D. Continue on an uncertain position until the next scheduled fix. D. Rely on one electronic source when independent information conflicts.
Correct Answer: C Correct Answer: A
Explanation: The selected action best supports safe, compliant, and technically sound Explanation: A defensible professional decision should be based on current evidence and
performance because it addresses STCW competence, drills, records and professional applicable criteria. The other choices rely on assumption, remove safeguards, or change
watchkeeping standards using observable evidence rather than convenience. conditions before the cause is understood.
2. An alarm occurs during machinery operation. Which evidence is most important 11. A position fix disagrees with the expected track. Which sequence is most
when evaluating STCW competence? appropriate when carrying out Navigation rules?
A. Use a single navigation source after another source shows a material discrepancy. A. Rely on one electronic source when independent information conflicts.
B. Review weather, tide/current, under-keel clearance and route hazards and compare B. Make a series of small course changes that are difficult to detect.
the findings with the applicable criteria. C. Cross-check position, traffic and navigation sources before altering the passage
C. Assume constant bearing is harmless when range is decreasing. plan, then verify the resulting state before moving to the next step.
D. Silence a machinery alarm and continue at the same load without investigation. D. Assume there is no risk because the other vessel is visually small.
Correct Answer: B Correct Answer: C
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.
12. A position fix disagrees with the expected track; a target bearing remains
3. A position fix disagrees with the expected track. Which response best controls nearly constant as range decreases. Which choice demonstrates the strongest
the primary risk associated with professional watchkeeping standards? control of watchkeeping responsibilities?
A. Rely on one electronic source when independent information conflicts. A. Use all available means to determine collision risk and take early, substantial
B. Make a series of small course changes that are difficult to detect. action consistent with the applicable navigation rules.
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. Continue on an uncertain position until the next scheduled fix.
plan. D. Make a series of small course changes that are difficult to detect.
Correct Answer: D Correct Answer: A
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.
4. An alarm occurs during machinery operation; a target bearing remains nearly 13. A vessel must plan a passage through constrained waters. What is required
constant as range decreases. Before proceeding with work involving before accepting the result related to bridge resource management?
Communications, GMDSS awareness and distress/urgency procedures, what should be A. Review pollution-prevention requirements and the condition of containment systems
verified? and compare the findings with the applicable criteria.
A. Silence a machinery alarm and continue at the same load without investigation. B. Discharge a small contaminant amount rather than initiating the response procedure.
B. Review machinery pressures, temperatures, alarms and operating limits and compare C. Make an unverified ballast change solely to improve trim.
the findings with the applicable criteria. 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: The strongest exam-style response is the one that controls immediate risk,
Correct Answer: B checks the relevant condition, and then acts within the defined requirements for bridge
Explanation: The correct choice follows a verify-act-confirm sequence. That is more resource management.
reliable than bypassing controls or making multiple uncontrolled changes.
14. A deck watch detects a change in bearing to another vessel. Under these
5. A vessel approaches restricted visibility with traffic nearby. Which conditions, when should the issue involving Chartwork, publications, voyage
troubleshooting approach is most appropriate for GMDSS awareness? planning and position fixing be escalated?
A. Make an unverified ballast change solely to improve trim. A. Use a single navigation source after another source shows a material discrepancy.
B. Depart with required safety equipment inoperative because the voyage is short. B. Use all available means to assess collision risk and take early, substantial action
C. Correct a required safety-equipment deficiency before sailing when the vessel consistent with the applicable navigation rules.
cannot legally or safely depart. C. Assume constant bearing is harmless when range is decreasing.
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: C Correct Answer: B
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 GMDSS facts, apply the appropriate control, and verify the result before closure.
awareness.
15. A vessel must plan a passage through constrained waters. Which comparison is
6. A towing or deck operation is affected by changing weather. Which action best most useful for interpreting voyage planning?
supports a defensible decision about distress/urgency procedures? A. 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. B. Depart with required safety equipment inoperative because the voyage is short.
C. Use all available means to assess collision risk and take early, substantial action C. Discharge a small contaminant amount rather than initiating the response procedure.
consistent with the applicable navigation rules. D. Make an unverified ballast change solely to improve trim.
D. Use a single navigation source after another source shows a material discrepancy. Correct Answer: A
Correct Answer: C 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 voyage
facts, apply the appropriate control, and verify the result before closure. planning.
7. The vessel approaches a traffic or pilotage constraint. A change affecting 16. A vessel approaches restricted visibility with traffic nearby; visibility
Collision avoidance, maneuvering, pilotage and restricted-water operations is falls below one nautical mile. Which action best distinguishes the underlying
being considered. How should it be handled? cause from a symptom in position fixing?
A. Rely on one electronic source when independent information conflicts. A. Verify the loading and stability data before accepting a cargo or ballast change,
B. Make a series of small course changes that are difficult to detect. then confirm that the corrective action is effective before closure.
C. Assume there is no risk because the other vessel is visually small. B. Silence a machinery alarm and continue at the same load without investigation.
D. Cross-check position, traffic and navigation sources before altering the passage C. Use a single navigation source after another source shows a material discrepancy.
plan. D. Assume constant bearing is harmless when range is decreasing.
Correct Answer: D Correct Answer: A
Explanation: This approach preserves control of the situation while producing evidence Explanation: This answer uses verified evidence before action, which reduces the chance
that can confirm whether the action actually corrected the issue involving Collision of masking the real problem and supports a traceable decision about position fixing.
avoidance, maneuvering, pilotage and restricted-water operations.
17. The vessel approaches a traffic or pilotage constraint. Which response is
8. A position fix disagrees with the expected track; visibility falls below one most consistent with the professional or compliance requirements governing
nautical mile. The abnormal condition directly affects Collision avoidance. What Meteorology, tides, currents and environmental conditions affecting safe
is the most appropriate response? navigation?
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. 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 C. Rely on one electronic source when independent information conflicts.
action consistent with the applicable navigation rules. D. Continue on an uncertain position until the next scheduled fix.
Correct Answer: D Correct Answer: B
Explanation: This answer uses verified evidence before action, which reduces the chance Explanation: The selected action best supports safe, compliant, and technically sound
of masking the real problem and supports a traceable decision about Collision avoidance. performance because it addresses Meteorology, tides, currents and environmental
conditions affecting safe navigation using observable evidence rather than convenience.
9. A navigation fix does not agree with another available source. Which
documentation approach best supports traceability for restricted-water 18. Another vessel remains on nearly constant bearing while range decreases.
operations? Which handoff practice best reduces error risk for environmental conditions
A. Record the observed condition, supporting evidence, decision and responsible affecting safe navigation?
follow-up; communicate any unresolved risk to the next responsible person. 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. Discharge a small contaminant amount rather than initiating the response procedure. C. Rely on one electronic source when independent information conflicts.
D. Make an unverified ballast change solely to improve trim. D. Record the observed condition, supporting evidence, decision and responsible
Correct Answer: A follow-up; communicate any unresolved risk to the next responsible person.
Explanation: The selected action best supports safe, compliant, and technically sound Correct Answer: D
performance because it addresses restricted-water operations 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.
1
,USCG Merchant Mariner Credential Exam General Subjects I | Practice Exam Q&A
19. Ballast is proposed to correct a list. Which decision about Ship stability, 28. A spill occurs during machinery or cargo operations; visibility falls below
trim, loading and basic stability calculations is best supported by the available one nautical mile. The abnormal condition directly affects emergency procedures.
evidence? What is the most appropriate response?
A. Accept a loading condition based only on even draft readings. A. Stop or control the operation, protect personnel and follow the required emergency
B. Ignore slack-tank effects because total liquid weight is unchanged. or pollution-response procedure.
C. Correct a list by moving weight without checking stability impact. B. Continue the transfer until the planned quantity is complete.
D. Account for free-surface and weight-shift effects when evaluating stability and C. Depart with required safety equipment unavailable because conditions are calm.
trim. D. Enter an enclosed space based only on a prior atmosphere test.
Correct Answer: D Correct Answer: A
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.
20. A slack tank creates additional free-surface effect; a navigation fix differs 29. A pump loses discharge pressure while demand remains constant. Which
by 0.8 nautical mile from another source. Which review step adds the most value documentation approach best supports traceability for Fire prevention,
before closing work involving Ship stability? firefighting, damage control and abandonment procedures?
A. Correct a list by moving weight without checking stability impact. A. Increase machinery load to see whether the abnormal indication clears.
B. Account for free-surface and weight-shift effects when evaluating stability and B. Record the observed condition, supporting evidence, decision and responsible
trim, then confirm that the corrective action is effective before closure. follow-up; communicate any unresolved risk to the next responsible person.
C. Move heavy cargo higher to free lower deck space without recalculation. C. Make several plant changes simultaneously before recording the original condition.
D. Ignore slack-tank effects because total liquid weight is unchanged. D. Disable an alarm that is interrupting operations.
Correct Answer: B Correct Answer: B
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 Fire
prevention, firefighting, damage control and abandonment procedures.
21. Ballast is proposed to correct a list. With respect to basic stability
calculations, what is the best FIRST action? 30. A stability calculation is required after cargo or ballast changes. Which
A. Ignore slack-tank effects because total liquid weight is unchanged. action is most likely to prevent recurrence of a problem involving Fire
B. Account for free-surface and weight-shift effects when evaluating stability and prevention?
trim. A. Verify the loading and stability data before accepting a cargo or ballast change,
C. Accept a loading condition based only on even draft readings. then confirm that the corrective action is effective before closure.
D. Move heavy cargo higher to free lower deck space without recalculation. B. Assume constant bearing is harmless when range is decreasing.
Correct Answer: B C. Silence a machinery alarm and continue at the same load without investigation.
Explanation: The strongest exam-style response is the one that controls immediate risk, D. Use a single navigation source after another source shows a material discrepancy.
checks the relevant condition, and then acts within the defined requirements for basic Correct Answer: A
stability calculations. Explanation: The correct response protects the integrity of the process: establish the
facts, apply the appropriate control, and verify the result before closure.
22. Cargo loading changes the vessel's vertical center of gravity. Which evidence
is most important when evaluating Cargo operations, stowage, securing and hazards 31. An alarm appears after a change in plant configuration. Which sequence is
relevant to vessel type? most appropriate when carrying out damage control?
A. Move heavy cargo higher to free lower deck space without recalculation. A. Make several plant changes simultaneously before recording the original condition.
B. Correct a list by moving weight without checking stability impact. B. Increase machinery load to see whether the abnormal indication clears.
C. Accept a loading condition based only on even draft readings. C. Reset a protective trip repeatedly without finding the cause.
D. Review displacement, weight location, GM/stability data and tank condition and D. Compare operating pressures/temperatures, equipment status and recent changes to
compare the findings with the applicable criteria. isolate the fault safely, then verify the resulting state before moving to the next
Correct Answer: D step.
Explanation: The correct response protects the integrity of the process: establish the Correct Answer: D
facts, apply the appropriate control, and verify the result before closure. Explanation: This approach preserves control of the situation while producing evidence
that can confirm whether the action actually corrected the issue involving damage
23. A deck load is shifted to a higher position. Which response best controls the control.
primary risk associated with Cargo operations?
A. Accept a loading condition based only on even draft readings. 32. A pollution-prevention control is compromised during operations; a navigation
B. Ignore slack-tank effects because total liquid weight is unchanged. fix differs by 0.8 nautical mile from another source. Which choice demonstrates
C. Correct a list by moving weight without checking stability impact. the strongest control of abandonment procedures?
D. Account for free-surface and weight-shift effects when evaluating stability and A. Use a single navigation source after another source shows a material discrepancy.
trim. B. Use all available means to assess collision risk and take early, substantial action
Correct Answer: D consistent with the applicable navigation rules.
Explanation: This approach preserves control of the situation while producing evidence C. Assume constant bearing is harmless when range is decreasing.
that can confirm whether the action actually corrected the issue involving Cargo D. Silence a machinery alarm and continue at the same load without investigation.
operations. Correct Answer: B
Explanation: This answer uses verified evidence before action, which reduces the chance
24. An engineering watch observes an abnormal temperature or pressure; the vessel
of masking the real problem and supports a traceable decision about abandonment
draft increases after cargo loading. Before proceeding with work involving procedures.
hazards relevant to vessel type, what should be verified?
A. Review position, course, speed, traffic and applicable navigation rules and compare 33. The vessel approaches a traffic or pilotage constraint. What is required
the findings with the applicable criteria. before accepting the result related to STCW competence, drills, records and
B. Assume constant bearing is harmless when range is decreasing. professional watchkeeping standards?
C. Silence a machinery alarm and continue at the same load without investigation. A. Make a series of small course changes that are difficult to detect.
D. Use a single navigation source after another source shows a material discrepancy. B. Rely on one electronic source when independent information conflicts.
Correct Answer: A C. Review position sources, charted hazards, depth/under-keel clearance and traffic
Explanation: This answer uses verified evidence before action, which reduces the chance and compare the findings with the applicable criteria.
of masking the real problem and supports a traceable decision about hazards relevant to D. Continue on an uncertain position until the next scheduled fix.
vessel type. Correct Answer: C
Explanation: The selected action best supports safe, compliant, and technically sound
25. A spill occurs during machinery or cargo operations. Which troubleshooting
performance because it addresses STCW competence, drills, records and professional
approach is most appropriate for Marine safety systems, lifesaving appliances and watchkeeping standards using observable evidence rather than convenience.
emergency procedures?
A. Enter an enclosed space based only on a prior atmosphere test. 34. A navigation fix does not agree with another available source. Under these
B. Wash a small spill overboard rather than initiating the response process. conditions, when should the issue involving STCW competence be escalated?
C. Correct a required safety-equipment deficiency and verify readiness before A. Silence a machinery alarm and continue at the same load without investigation.
proceeding. B. Use a single navigation source after another source shows a material discrepancy.
D. Depart with required safety equipment unavailable because conditions are calm. C. Use all available means to assess collision risk and take early, substantial action
Correct Answer: C consistent with the applicable navigation rules.
Explanation: The selected action best supports safe, compliant, and technically sound D. Assume constant bearing is harmless when range is decreasing.
performance because it addresses Marine safety systems, lifesaving appliances and Correct Answer: C
emergency procedures using observable evidence rather than convenience. Explanation: A defensible professional decision should be based on current evidence and
applicable criteria. The other choices rely on assumption, remove safeguards, or change
26. An enclosed-space task is proposed without a completed entry check. Which conditions before the cause is understood.
action best supports a defensible decision about Marine safety systems?
A. Depart with required safety equipment unavailable because conditions are calm. 35. A position fix disagrees with the expected track. Which comparison is most
B. Continue the transfer until the planned quantity is complete. useful for interpreting professional watchkeeping standards?
C. Stop or control the operation, protect personnel and follow the required emergency A. Review position sources, charted hazards, depth/under-keel clearance and traffic
or pollution-response procedure. and compare the findings with the applicable criteria.
D. Wash a small spill overboard rather than initiating the response process. B. Rely on one electronic source when independent information conflicts.
Correct Answer: C C. Make a series of small course changes that are difficult to detect.
Explanation: A defensible professional decision should be based on current evidence and D. Assume there is no risk because the other vessel is visually small.
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.
27. A deck watch detects a change in bearing to another vessel. A change
affecting lifesaving appliances is being considered. How should it be handled? 36. A navigation fix does not agree with another available source; the vessel
A. Correct a required safety-equipment deficiency before sailing when the vessel draft increases after cargo loading. Which action best distinguishes the
cannot legally or safely depart. underlying cause from a symptom in Communications, GMDSS awareness and
B. Depart with required safety equipment inoperative because the voyage is short. distress/urgency procedures?
C. Discharge a small contaminant amount rather than initiating the response procedure. A. Assume constant bearing is harmless when range is decreasing.
D. Make an unverified ballast change solely to improve trim. B. Silence a machinery alarm and continue at the same load without investigation.
Correct Answer: A C. Use a single navigation source after another source shows a material discrepancy.
Explanation: This is the most appropriate option because it connects the observed D. Verify the loading and stability data before accepting a cargo or ballast change,
condition to the governing requirement and leaves a record of why the decision was made. then confirm that the corrective action is effective before closure.
Correct Answer: D
Explanation: The correct choice follows a verify-act-confirm sequence. That is more
reliable than bypassing controls or making multiple uncontrolled changes.
2
, USCG Merchant Mariner Credential Exam General Subjects I | Practice Exam Q&A
37. A stability calculation is required after cargo or ballast changes. Which 46. An engineering watch observes an abnormal temperature or pressure. Which
response is most consistent with the professional or compliance requirements action best supports a defensible decision about Chartwork, publications, voyage
governing GMDSS awareness? planning and position fixing?
A. Discharge a small contaminant amount rather than initiating the response procedure. A. Silence a machinery alarm and continue at the same load without investigation.
B. Make an unverified ballast change solely to improve trim. B. Use a single navigation source after another source shows a material discrepancy.
C. Depart with required safety equipment inoperative because the voyage is short. C. Use all available means to assess collision risk and take early, substantial action
D. Correct a required safety-equipment deficiency before sailing when the vessel consistent with the applicable navigation rules.
cannot legally or safely depart. D. Assume constant bearing is harmless when range is decreasing.
Correct Answer: D 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 GMDSS facts, apply the appropriate control, and verify the result before closure.
awareness.
47. A towing or deck operation is affected by changing weather. A change
38. A pollution-prevention control is compromised during operations. Which affecting voyage planning is being considered. How should it be handled?
handoff practice best reduces error risk for distress/urgency procedures? A. Make an unverified ballast change solely to improve trim.
A. Use a single navigation source after another source shows a material discrepancy. B. Depart with required safety equipment inoperative because the voyage is short.
B. Record the observed condition, supporting evidence, decision and responsible C. Correct a required safety-equipment deficiency before sailing when the vessel
follow-up; communicate any unresolved risk to the next responsible person. cannot legally or safely depart.
C. Assume constant bearing is harmless when range is decreasing. 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: C
Correct Answer: B 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 voyage
facts, apply the appropriate control, and verify the result before closure. planning.
39. The vessel approaches a traffic or pilotage constraint. Which decision about 48. A stability calculation is required after cargo or ballast changes; a
Collision avoidance, maneuvering, pilotage and restricted-water operations is machinery temperature rises 20 C above its normal trend. The abnormal condition
best supported by the available evidence? directly affects position fixing. What is the most appropriate response?
A. Cross-check position, traffic and navigation sources before altering the passage A. Assume constant bearing is harmless when range is decreasing.
plan. B. Silence a machinery alarm and continue at the same load without investigation.
B. Rely on one electronic source when independent information conflicts. C. Use a single navigation source after another source shows a material discrepancy.
C. Make a series of small course changes that are difficult to detect. D. Use all available means to assess collision risk and take early, substantial action
D. Assume there is no risk because the other vessel is visually small. consistent with the applicable navigation rules.
Correct Answer: A Correct Answer: D
Explanation: This approach preserves control of the situation while producing evidence Explanation: This answer uses verified evidence before action, which reduces the chance
that can confirm whether the action actually corrected the issue involving Collision of masking the real problem and supports a traceable decision about position fixing.
avoidance, maneuvering, pilotage and restricted-water operations.
49. The vessel approaches a traffic or pilotage constraint. Which documentation
40. A position fix disagrees with the expected track; a machinery temperature approach best supports traceability for Meteorology, tides, currents and
rises 20 C above its normal trend. Which review step adds the most value before environmental conditions affecting safe navigation?
closing work involving Collision avoidance? A. Make a series of small course changes that are difficult to detect.
A. Assume there is no risk because the other vessel is visually small. B. Rely on one electronic source when independent information conflicts.
B. Continue on an uncertain position until the next scheduled fix. C. Record the observed condition, supporting evidence, decision and responsible
C. Make a series of small course changes that are difficult to detect. follow-up; communicate any unresolved risk to the next responsible person.
D. Cross-check position, traffic and navigation sources before altering the passage D. Continue on an uncertain position until the next scheduled fix.
plan, then confirm that the corrective action is effective before closure. Correct Answer: C
Correct Answer: D Explanation: The selected action best supports safe, compliant, and technically sound
Explanation: This answer uses verified evidence before action, which reduces the chance performance because it addresses Meteorology, tides, currents and environmental
of masking the real problem and supports a traceable decision about Collision avoidance. conditions affecting safe navigation using observable evidence rather than convenience.
41. A vessel approaches restricted visibility with traffic nearby. With respect 50. Another vessel remains on nearly constant bearing while range decreases.
to restricted-water operations, what is the best FIRST action? Which action is most likely to prevent recurrence of a problem involving
A. Make an unverified ballast change solely to improve trim. environmental conditions affecting safe navigation?
B. Depart with required safety equipment inoperative because the voyage is short. A. Continue on an uncertain position until the next scheduled fix.
C. Correct a required safety-equipment deficiency before sailing when the vessel B. Cross-check position, traffic and navigation sources before altering the passage
cannot legally or safely depart. plan, then confirm that the corrective action is effective before closure.
D. Discharge a small contaminant amount rather than initiating the response procedure. C. Assume there is no risk because the other vessel is visually small.
Correct Answer: C D. Rely on one electronic source when independent information conflicts.
Explanation: The selected action best supports safe, compliant, and technically sound Correct Answer: B
performance because it addresses restricted-water operations 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.
42. Another vessel remains on nearly constant bearing while range decreases.
Which evidence is most important when evaluating Navigation rules, watchkeeping 51. Ballast is proposed to correct a list. Which sequence is most appropriate
responsibilities and bridge resource management? when carrying out Ship stability, trim, loading and basic stability calculations?
A. Continue on an uncertain position until the next scheduled fix. A. Account for free-surface and weight-shift effects when evaluating stability and
B. Review bearing/range trend, own-ship course/speed, target aspect and applicable trim, then verify the resulting state before moving to the next step.
rule and compare the findings with the applicable criteria. B. Accept a loading condition based only on even draft readings.
C. Assume there is no risk because the other vessel is visually small. C. Ignore slack-tank effects because total liquid weight is unchanged.
D. Rely on one electronic source when independent information conflicts. D. Correct a list by moving weight without checking stability impact.
Correct Answer: B Correct Answer: A
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.
52. A slack tank creates additional free-surface effect; a target bearing remains
43. A position fix disagrees with the expected track. Which response best nearly constant as range decreases. Which choice demonstrates the strongest
controls the primary risk associated with Navigation rules? control of Ship stability?
A. Rely on one electronic source when independent information conflicts. A. Recalculate the relevant stability condition before accepting the loading or
B. Make a series of small course changes that are difficult to detect. ballast change.
C. Assume there is no risk because the other vessel is visually small. B. Correct a list by moving weight without checking stability impact.
D. Cross-check position, traffic and navigation sources before altering the passage C. Move heavy cargo higher to free lower deck space without recalculation.
plan. D. Ignore slack-tank effects because total liquid weight is unchanged.
Correct Answer: D Correct Answer: A
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.
44. A position fix disagrees with the expected track; the vessel draft increases 53. Ballast is proposed to correct a list. What is required before accepting the
after cargo loading. Before proceeding with work involving watchkeeping result related to basic stability calculations?
responsibilities, what should be verified? A. Review loading manual limits, free-surface moment and resulting draft/trim and
A. Assume there is no risk because the other vessel is visually small. compare the findings with the applicable criteria.
B. Continue on an uncertain position until the next scheduled fix. B. Ignore slack-tank effects because total liquid weight is unchanged.
C. Make a series of small course changes that are difficult to detect. C. Accept a loading condition based only on even draft readings.
D. Review bearing/range trend, own-ship course/speed, target aspect and applicable D. Move heavy cargo higher to free lower deck space without recalculation.
rule and compare the findings with the applicable criteria. Correct Answer: A
Correct Answer: D Explanation: The strongest exam-style response is the one that controls immediate risk,
Explanation: The correct choice follows a verify-act-confirm sequence. That is more checks the relevant condition, and then acts within the defined requirements for basic
reliable than bypassing controls or making multiple uncontrolled changes. stability calculations.
45. A towing or deck operation is affected by changing weather. Which 54. Cargo loading changes the vessel's vertical center of gravity. Under these
troubleshooting approach is most appropriate for bridge resource management? conditions, when should the issue involving Cargo operations, stowage, securing
A. Correct a required safety-equipment deficiency before sailing when the vessel and hazards relevant to vessel type be escalated?
cannot legally or safely depart. A. Move heavy cargo higher to free lower deck space without recalculation.
B. Depart with required safety equipment inoperative because the voyage is short. B. Correct a list by moving weight without checking stability impact.
C. Discharge a small contaminant amount rather than initiating the response procedure. C. Recalculate the relevant stability condition before accepting the loading or
D. Make an unverified ballast change solely to improve trim. ballast change.
Correct Answer: A D. Accept a loading condition based only on even draft readings.
Explanation: The strongest exam-style response is the one that controls immediate risk, Correct Answer: C
checks the relevant condition, and then acts within the defined requirements for bridge Explanation: The correct response protects the integrity of the process: establish the
resource management. facts, apply the appropriate control, and verify the result before closure.
3
