USCG Chief Mate and Master Mariner License
Exam | Practice Questions & Answers
ID14163
,USCG Chief Mate and Master Mariner License Exam | Practice Questions & Answers
1. A pollution-prevention barrier is found compromised during transfer. With 10. A stability calculation is required after cargo or ballast changes. Which
respect to Pollution prevention, MARPOL principles and environmental protection, action is most likely to prevent recurrence of a problem involving
what is the best FIRST action? distress/urgency procedures?
A. Stop or control the operation, protect personnel and follow the required emergency A. Discharge a small contaminant amount rather than initiating the response procedure.
or pollution-response procedure. B. Verify the loading and stability data before accepting a cargo or ballast change,
B. Continue the transfer until the planned quantity is complete. then confirm that the corrective action is effective before closure.
C. Depart with required safety equipment unavailable because conditions are calm. C. Make an unverified ballast change solely to improve trim.
D. Enter an enclosed space based only on a prior atmosphere test. D. Depart with required safety equipment inoperative because the voyage is short.
Correct Answer: A 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 Pollution performance because it addresses distress/urgency procedures using observable evidence
prevention, MARPOL principles and environmental protection. rather than convenience.
2. Required lifesaving equipment is not ready before departure. Which evidence is 11. A position fix disagrees with the expected track. Which sequence is most
most important when evaluating Pollution prevention? appropriate when carrying out Collision avoidance, maneuvering, pilotage and
A. Enter an enclosed space based only on a prior atmosphere test. restricted-water operations?
B. Wash a small spill overboard rather than initiating the response process. A. Continue on an uncertain position until the next scheduled fix.
C. Depart with required safety equipment unavailable because conditions are calm. B. Use all available means to determine collision risk and take early, substantial
D. Review equipment inventory, inspection status and operational readiness and compare action consistent with the applicable navigation rules, then verify the resulting
the findings with the applicable criteria. state before moving to the next step.
Correct Answer: D C. Assume there is no risk because the other vessel is visually small.
Explanation: The selected action best supports safe, compliant, and technically sound D. Rely on one electronic source when independent information conflicts.
performance because it addresses Pollution prevention using observable evidence rather Correct Answer: B
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
3. A navigation fix does not agree with another available source. Which response
conditions before the cause is understood.
best controls the primary risk associated with MARPOL principles?
A. Use all available means to assess collision risk and take early, substantial action 12. Visibility falls and several targets appear on radar; visibility falls below
consistent with the applicable navigation rules. one nautical mile. Which choice demonstrates the strongest control of Collision
B. Assume constant bearing is harmless when range is decreasing. avoidance?
C. Silence a machinery alarm and continue at the same load without investigation. A. Rely on one electronic source when independent information conflicts.
D. Use a single navigation source after another source shows a material discrepancy. B. Cross-check position, traffic and navigation sources before altering the passage
Correct Answer: A plan.
Explanation: A defensible professional decision should be based on current evidence and C. Make a series of small course changes that are difficult to detect.
applicable criteria. The other choices rely on assumption, remove safeguards, or change D. Assume there is no risk because the other vessel is visually small.
conditions before the cause is understood. Correct Answer: B
Explanation: This is the most appropriate option because it connects the observed
4. A pollution-prevention barrier is found compromised during transfer; a
condition to the governing requirement and leaves a record of why the decision was made.
navigation fix differs by 0.8 nautical mile from another source. Before
proceeding with work involving environmental protection, what should be verified? 13. An engineering watch observes an abnormal temperature or pressure. What is
A. Wash a small spill overboard rather than initiating the response process. required before accepting the result related to restricted-water operations?
B. Enter an enclosed space based only on a prior atmosphere test. A. Silence a machinery alarm and continue at the same load without investigation.
C. Review equipment inventory, inspection status and operational readiness and compare B. Use a single navigation source after another source shows a material discrepancy.
the findings with the applicable criteria. C. Assume constant bearing is harmless when range is decreasing.
D. Continue the transfer until the planned quantity is complete. D. Review machinery pressures, temperatures, alarms and operating limits and compare
Correct Answer: C the findings with the applicable criteria.
Explanation: This is the most appropriate option because it connects the observed Correct Answer: D
condition to the governing requirement and leaves a record of why the decision was made. Explanation: The correct choice follows a verify-act-confirm sequence. That is more
reliable than bypassing controls or making multiple uncontrolled changes.
5. A position fix disagrees with the expected track. Which troubleshooting
approach is most appropriate for STCW competence, drills, records and 14. The vessel approaches a traffic or pilotage constraint. Under these
professional watchkeeping standards? conditions, when should the issue involving Navigation rules, watchkeeping
A. Assume there is no risk because the other vessel is visually small. responsibilities and bridge resource management be escalated?
B. Use all available means to determine collision risk and take early, substantial A. Make a series of small course changes that are difficult to detect.
action consistent with the applicable navigation rules. B. Rely on one electronic source when independent information conflicts.
C. Continue on an uncertain position until the next scheduled fix. C. 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.
Correct Answer: B D. Continue on an uncertain position until the next scheduled fix.
Explanation: The correct choice follows a verify-act-confirm sequence. That is more Correct Answer: C
reliable than bypassing controls or making multiple uncontrolled changes. Explanation: The strongest exam-style response is the one that controls immediate risk,
checks the relevant condition, and then acts within the defined requirements for
6. A deck watch detects a change in bearing to another vessel. Which action best
Navigation rules, watchkeeping responsibilities and bridge resource management.
supports a defensible decision about STCW competence?
A. Correct a required safety-equipment deficiency before sailing when the vessel 15. Visibility falls and several targets appear on radar. Which comparison is
cannot legally or safely depart. most useful for interpreting Navigation rules?
B. Depart with required safety equipment inoperative because the voyage is short. A. Continue on an uncertain position until the next scheduled fix.
C. Discharge a small contaminant amount rather than initiating the response procedure. B. Assume there is no risk because the other vessel is visually small.
D. Make an unverified ballast change solely to improve trim. C. Rely on one electronic source when independent information conflicts.
Correct Answer: A D. Review bearing/range trend, own-ship course/speed, target aspect and applicable
Explanation: The strongest exam-style response is the one that controls immediate risk, rule and compare the findings with the applicable criteria.
checks the relevant condition, and then acts within the defined requirements for STCW Correct Answer: D
competence. Explanation: The correct response protects the integrity of the process: establish the
facts, apply the appropriate control, and verify the result before closure.
7. Visibility falls and several targets appear on radar. A change affecting
professional watchkeeping standards is being considered. How should it be 16. Visibility falls and several targets appear on radar; a target bearing
handled? remains nearly constant as range decreases. Which action best distinguishes the
A. Continue on an uncertain position until the next scheduled fix. underlying cause from a symptom in watchkeeping responsibilities?
B. Assume there is no risk because the other vessel is visually small. A. Cross-check position, traffic and navigation sources before altering the passage
C. Rely on one electronic source when independent information conflicts. plan, then confirm that the corrective action is effective before closure.
D. Use all available means to determine collision risk and take early, substantial B. Rely on one electronic source when independent information conflicts.
action consistent with the applicable navigation rules. C. Make a series of small course changes that are difficult to detect.
Correct Answer: D D. Assume there is no risk because the other vessel is visually small.
Explanation: The correct response protects the integrity of the process: establish the Correct Answer: A
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 watchkeeping
8. A deck watch detects a change in bearing to another vessel; a target bearing
responsibilities.
remains nearly constant as range decreases. The abnormal condition directly
affects Communications, GMDSS awareness and distress/urgency procedures. What is 17. A vessel approaches restricted visibility with traffic nearby. Which response
the most appropriate response? is most consistent with the professional or compliance requirements governing
A. Make an unverified ballast change solely to improve trim. bridge resource management?
B. Correct a required safety-equipment deficiency before sailing when the vessel A. Use a single navigation source after another source shows a material discrepancy.
cannot legally or safely depart. B. Assume constant bearing is harmless when range is decreasing.
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. Discharge a small contaminant amount rather than initiating the response procedure. consistent with the applicable navigation rules.
Correct Answer: B D. Silence a machinery alarm and continue at the same load without investigation.
Explanation: This approach preserves control of the situation while producing evidence Correct Answer: C
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.
9. A vessel must plan a passage through constrained waters. Which documentation
approach best supports traceability for GMDSS awareness? 18. An alarm occurs during machinery operation. Which handoff practice best
A. Assume constant bearing is harmless when range is decreasing. reduces error risk for Chartwork, publications, voyage planning and position
B. Record the observed condition, supporting evidence, decision and responsible fixing?
follow-up; communicate any unresolved risk to the next responsible person. A. Depart with required safety equipment inoperative because the voyage is short.
C. Silence a machinery alarm and continue at the same load without investigation. B. Record the observed condition, supporting evidence, decision and responsible
D. Use a single navigation source after another source shows a material discrepancy. follow-up; communicate any unresolved risk to the next responsible person.
Correct Answer: B C. Discharge a small contaminant amount rather than initiating the response procedure.
Explanation: This answer uses verified evidence before action, which reduces the chance D. Make an unverified ballast change solely to improve trim.
of masking the real problem and supports a traceable decision about GMDSS awareness. Correct Answer: B
Explanation: The selected action best supports safe, compliant, and technically sound
performance because it addresses Chartwork, publications, voyage planning and position
fixing using observable evidence rather than convenience.
1
,USCG Chief Mate and Master Mariner License Exam | Practice Questions & Answers
19. A vessel approaches restricted visibility with traffic nearby. Which decision 28. A navigation fix does not agree with another available source; the vessel
about voyage planning is best supported by the available evidence? draft increases after cargo loading. The abnormal condition directly affects
A. Silence a machinery alarm and continue at the same load without investigation. hazards relevant to vessel type. What is the most appropriate response?
B. Use all available means to assess collision risk and take early, substantial action A. Discharge a small contaminant amount rather than initiating the response procedure.
consistent with the applicable navigation rules. B. Make an unverified ballast change solely to improve trim.
C. Use a single navigation source after another source shows a material discrepancy. C. Depart with required safety equipment inoperative because the voyage is short.
D. Assume constant bearing is harmless when range is decreasing. D. Correct a required safety-equipment deficiency before sailing when the vessel
Correct Answer: B cannot legally or safely depart.
Explanation: A defensible professional decision should be based on current evidence and Correct Answer: D
applicable criteria. The other choices rely on assumption, remove safeguards, or change Explanation: This is the most appropriate option because it connects the observed
conditions before the cause is understood. condition to the governing requirement and leaves a record of why the decision was made.
20. A vessel must plan a passage through constrained waters; visibility falls 29. An enclosed-space task is proposed without a completed entry check. Which
below one nautical mile. Which review step adds the most value before closing documentation approach best supports traceability for Marine safety systems,
work involving position fixing? lifesaving appliances and emergency procedures?
A. Make an unverified ballast change solely to improve trim. A. Continue the transfer until the planned quantity is complete.
B. Depart with required safety equipment inoperative because the voyage is short. B. Depart with required safety equipment unavailable because conditions are calm.
C. Discharge a small contaminant amount rather than initiating the response procedure. C. Enter an enclosed space based only on a prior atmosphere test.
D. Verify the loading and stability data before accepting a cargo or ballast change, D. 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.
Correct Answer: D Correct Answer: D
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.
21. A position fix disagrees with the expected track. With respect to 30. Required lifesaving equipment is not ready before departure. Which action is
Meteorology, tides, currents and environmental conditions affecting safe most likely to prevent recurrence of a problem involving Marine safety systems?
navigation, what is the best FIRST action? A. Enter an enclosed space based only on a prior atmosphere test.
A. Use all available means to determine collision risk and take early, substantial B. Wash a small spill overboard rather than initiating the response process.
action consistent with the applicable navigation rules. C. Depart with required safety equipment unavailable because conditions are calm.
B. Assume there is no risk because the other vessel is visually small. D. Correct a required safety-equipment deficiency and verify readiness before
C. Continue on an uncertain position until the next scheduled fix. proceeding, then confirm that the corrective action is effective before closure.
D. Make a series of small course changes that are difficult to detect. Correct Answer: D
Correct Answer: A 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 Marine
reliable than bypassing controls or making multiple uncontrolled changes. safety systems.
22. The vessel approaches a traffic or pilotage constraint. Which evidence is 31. An alarm occurs during machinery operation. Which sequence is most
most important when evaluating environmental conditions affecting safe appropriate when carrying out lifesaving appliances?
navigation? A. Cross-check navigation sources and resolve a position discrepancy before relying on
A. Make a series of small course changes that are difficult to detect. the fix, then verify the resulting state before moving to the next step.
B. Rely on one electronic source when independent information conflicts. B. Silence a machinery alarm and continue at the same load without investigation.
C. Review position sources, charted hazards, depth/under-keel clearance and traffic C. Use a single navigation source after another source shows a material discrepancy.
and compare the findings with the applicable criteria. D. Assume constant bearing is harmless when range is decreasing.
D. Continue on an uncertain position until the next scheduled fix. Correct Answer: A
Correct Answer: C Explanation: The correct response protects the integrity of the process: establish the
Explanation: The strongest exam-style response is the one that controls immediate risk, facts, apply the appropriate control, and verify the result before closure.
checks the relevant condition, and then acts within the defined requirements for
environmental conditions affecting safe navigation.
32. An enclosed-space task is proposed without a completed entry check;
visibility falls below one nautical mile. Which choice demonstrates the strongest
23. A slack tank creates additional free-surface effect. Which response best control of emergency procedures?
controls the primary risk associated with Ship stability, trim, loading and basic A. Wash a small spill overboard rather than initiating the response process.
stability calculations? B. Enter an enclosed space based only on a prior atmosphere test.
A. Move heavy cargo higher to free lower deck space without recalculation. C. Correct a required safety-equipment deficiency and verify readiness before
B. Correct a list by moving weight without checking stability impact. proceeding.
C. Recalculate the relevant stability condition before accepting the loading or D. Continue the transfer until the planned quantity is complete.
ballast change. Correct Answer: C
D. Accept a loading condition based only on even draft readings. Explanation: This approach preserves control of the situation while producing evidence
Correct Answer: C that can confirm whether the action actually corrected the issue involving emergency
Explanation: The correct response protects the integrity of the process: establish the procedures.
facts, apply the appropriate control, and verify the result before closure.
33. A pollution-prevention barrier is found compromised during transfer. What is
24. Cargo loading changes the vessel's vertical center of gravity; a navigation required before accepting the result related to Pollution prevention, MARPOL
fix differs by 0.8 nautical mile from another source. Before proceeding with work principles and environmental protection?
involving Ship stability, what should be verified? A. Continue the transfer until the planned quantity is complete.
A. Accept a loading condition based only on even draft readings. B. Depart with required safety equipment unavailable because conditions are calm.
B. Ignore slack-tank effects because total liquid weight is unchanged. C. Enter an enclosed space based only on a prior atmosphere test.
C. Correct a list by moving weight without checking stability impact. D. Review source/quantity of release, containment condition, notifications and
D. Review loading manual limits, free-surface moment and resulting draft/trim and response equipment and compare the findings with the applicable criteria.
compare the findings with the applicable criteria. Correct Answer: D
Correct Answer: D Explanation: This answer uses verified evidence before action, which reduces the chance
Explanation: This approach preserves control of the situation while producing evidence of masking the real problem and supports a traceable decision about Pollution
that can confirm whether the action actually corrected the issue involving Ship prevention, MARPOL principles and environmental protection.
stability.
34. Required lifesaving equipment is not ready before departure. Under these
25. A slack tank creates additional free-surface effect. Which troubleshooting conditions, when should the issue involving Pollution prevention be escalated?
approach is most appropriate for basic stability calculations? A. Enter an enclosed space based only on a prior atmosphere test.
A. Correct a list by moving weight without checking stability impact. B. Wash a small spill overboard rather than initiating the response process.
B. Move heavy cargo higher to free lower deck space without recalculation. C. Depart with required safety equipment unavailable because conditions are calm.
C. Recalculate the relevant stability condition before accepting the loading or D. Correct a required safety-equipment deficiency and verify readiness before
ballast change. proceeding.
D. Ignore slack-tank effects because total liquid weight is unchanged. Correct Answer: D
Correct Answer: C 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 Pollution prevention using observable evidence rather
of masking the real problem and supports a traceable decision about basic stability than convenience.
calculations.
35. A vessel approaches restricted visibility with traffic nearby. Which
26. A deck load is shifted to a higher position. Which action best supports a comparison is most useful for interpreting MARPOL principles?
defensible decision about Cargo operations, stowage, securing and hazards A. Use a single navigation source after another source shows a material discrepancy.
relevant to vessel type? B. Review weather, tide/current, under-keel clearance and route hazards and compare
A. Ignore slack-tank effects because total liquid weight is unchanged. the findings with the applicable criteria.
B. Account for free-surface and weight-shift effects when evaluating stability and C. Assume constant bearing is harmless when range is decreasing.
trim. D. Silence a machinery alarm and continue at the same load without investigation.
C. Accept a loading condition based only on even draft readings. Correct Answer: B
D. Move heavy cargo higher to free lower deck space without recalculation. Explanation: A defensible professional decision should be based on current evidence and
Correct Answer: B applicable criteria. The other choices rely on assumption, remove safeguards, or change
Explanation: The selected action best supports safe, compliant, and technically sound conditions before the cause is understood.
performance because it addresses Cargo operations, stowage, securing and hazards
36. A pollution-prevention barrier is found compromised during transfer; a target
relevant to vessel type using observable evidence rather than convenience.
bearing remains nearly constant as range decreases. Which action best
27. Ballast is proposed to correct a list. A change affecting Cargo operations is distinguishes the underlying cause from a symptom in environmental protection?
being considered. How should it be handled? A. Correct a required safety-equipment deficiency and verify readiness before
A. Move heavy cargo higher to free lower deck space without recalculation. proceeding, then confirm that the corrective action is effective before closure.
B. Correct a list by moving weight without checking stability impact. B. Wash a small spill overboard rather than initiating the response process.
C. Accept a loading condition based only on even draft readings. C. Enter an enclosed space based only on a prior atmosphere test.
D. Recalculate the relevant stability condition before accepting the loading or D. Continue the transfer until the planned quantity is complete.
ballast change. Correct Answer: A
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.
2
, USCG Chief Mate and Master Mariner License Exam | Practice Questions & Answers
37. A position fix disagrees with the expected track. Which response is most 46. The vessel approaches a traffic or pilotage constraint. Which action best
consistent with the professional or compliance requirements governing STCW supports a defensible decision about Navigation rules, watchkeeping
competence, drills, records and professional watchkeeping standards? responsibilities and bridge resource management?
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. Use all available means to determine collision risk and take early, substantial plan.
action consistent with the applicable navigation rules. C. Rely on one electronic source when independent information conflicts.
D. Make a series of small course changes that are difficult to detect. D. Continue on an uncertain position until the next scheduled fix.
Correct Answer: C 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
Navigation rules, watchkeeping responsibilities and bridge resource management.
38. An engineering watch observes an abnormal temperature or pressure. Which
handoff practice best reduces error risk for STCW competence? 47. Visibility falls and several targets appear on radar. A change affecting
A. Make an unverified ballast change solely to improve trim. Navigation rules is being considered. How should it be handled?
B. Depart with required safety equipment inoperative because the voyage is short. A. Use all available means to determine collision risk and take early, substantial
C. Discharge a small contaminant amount rather than initiating the response procedure. action consistent with the applicable navigation rules.
D. Record the observed condition, supporting evidence, decision and responsible B. Continue on an uncertain position until the next scheduled fix.
follow-up; communicate any unresolved risk to the next responsible person. C. Assume there is no risk because the other vessel is visually small.
Correct Answer: D D. Rely on one electronic source when independent information conflicts.
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 STCW Explanation: The correct response protects the integrity of the process: establish the
competence. facts, apply the appropriate control, and verify the result before closure.
39. Visibility falls and several targets appear on radar. Which decision about 48. Visibility falls and several targets appear on radar; the vessel draft
professional watchkeeping standards is best supported by the available evidence? increases after cargo loading. The abnormal condition directly affects
A. Continue on an uncertain position until the next scheduled fix. watchkeeping responsibilities. What is the most appropriate response?
B. Use all available means to determine collision risk and take early, substantial A. Rely on one electronic source when independent information conflicts.
action consistent with the applicable navigation rules. B. Make a series of small course changes that are difficult to detect.
C. Assume there is no risk because the other vessel is visually small. C. Cross-check position, traffic and navigation sources before altering the passage
D. Rely on one electronic source when independent information conflicts. plan.
Correct Answer: B D. Assume there is no risk because the other vessel is visually small.
Explanation: The correct response protects the integrity of the process: establish the Correct Answer: C
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 watchkeeping
40. An engineering watch observes an abnormal temperature or pressure; the vessel responsibilities.
draft increases after cargo loading. Which review step adds the most value before
closing work involving Communications, GMDSS awareness and distress/urgency 49. A stability calculation is required after cargo or ballast changes. Which
procedures? documentation approach best supports traceability for bridge resource management?
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. 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. Depart with required safety equipment inoperative because the voyage is short. D. Assume constant bearing is harmless when range is decreasing.
Correct Answer: C Correct Answer: C
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 of masking the real problem and supports a traceable decision about bridge resource
Communications, GMDSS awareness and distress/urgency procedures. management.
41. A towing or deck operation is affected by changing weather. With respect to 50. A navigation fix does not agree with another available source. Which action
GMDSS awareness, what is the best FIRST action? is most likely to prevent recurrence of a problem involving Chartwork,
A. Use a single navigation source after another source shows a material discrepancy. publications, voyage planning and position fixing?
B. Use all available means to assess collision risk and take early, substantial action A. Make an unverified ballast change solely to improve trim.
consistent with the applicable navigation rules. B. Depart with required safety equipment inoperative because the voyage is short.
C. Assume constant bearing is harmless when range is decreasing. C. Discharge a small contaminant amount rather than initiating the response procedure.
D. Silence a machinery alarm and continue at the same load without investigation. D. Verify the loading and stability data before accepting a cargo or ballast change,
Correct Answer: B then confirm that the corrective action is effective before closure.
Explanation: This answer uses verified evidence before action, which reduces the chance Correct Answer: D
of masking the real problem and supports a traceable decision about GMDSS awareness. Explanation: The selected action best supports safe, compliant, and technically sound
performance because it addresses Chartwork, publications, voyage planning and position
42. A pre-departure check identifies a safety-equipment deficiency. Which fixing using observable evidence rather than convenience.
evidence is most important when evaluating distress/urgency procedures?
A. Depart with required safety equipment inoperative because the voyage is short. 51. A stability calculation is required after cargo or ballast changes. Which
B. Discharge a small contaminant amount rather than initiating the response procedure. sequence is most appropriate when carrying out voyage planning?
C. 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. Use all available means to assess collision risk and take early, substantial action
D. Make an unverified ballast change solely to improve trim. consistent with the applicable navigation rules, then verify the resulting state
Correct Answer: C before moving to the next step.
Explanation: The selected action best supports safe, compliant, and technically sound C. Silence a machinery alarm and continue at the same load without investigation.
performance because it addresses distress/urgency procedures using observable evidence D. Use a single navigation source after another source shows a material discrepancy.
rather than convenience. Correct Answer: B
Explanation: A defensible professional decision should be based on current evidence and
43. A position fix disagrees with the expected track. Which response best applicable criteria. The other choices rely on assumption, remove safeguards, or change
controls the primary risk associated with Collision avoidance, maneuvering, conditions before the cause is understood.
pilotage and restricted-water operations?
A. Continue on an uncertain position until the next scheduled fix. 52. A towing or deck operation is affected by changing weather; a machinery
B. Use all available means to determine collision risk and take early, substantial temperature rises 20 C above its normal trend. Which choice demonstrates the
action consistent with the applicable navigation rules. strongest control of position fixing?
C. Assume there is no risk because the other vessel is visually small. A. Discharge a small contaminant amount rather than initiating the response procedure.
D. Rely on one electronic source when independent information conflicts. B. Correct a required safety-equipment deficiency before sailing when the vessel
Correct Answer: B cannot legally or safely depart.
Explanation: A defensible professional decision should be based on current evidence and C. Make an unverified ballast change solely to improve trim.
applicable criteria. The other choices rely on assumption, remove safeguards, or change D. Depart with required safety equipment inoperative because the voyage is short.
conditions before the cause is understood. Correct Answer: B
Explanation: This is the most appropriate option because it connects the observed
44. Visibility falls and several targets appear on radar; a machinery temperature condition to the governing requirement and leaves a record of why the decision was made.
rises 20 C above its normal trend. Before proceeding with work involving
Collision avoidance, what should be verified? 53. A position fix disagrees with the expected track. What is required before
A. Rely on one electronic source when independent information conflicts. accepting the result related to Meteorology, tides, currents and environmental
B. Make a series of small course changes that are difficult to detect. conditions affecting safe navigation?
C. Review position sources, charted hazards, depth/under-keel clearance and traffic A. Review bearing/range trend, own-ship course/speed, target aspect and applicable
and compare the findings with the applicable criteria. rule and compare the findings with the applicable criteria.
D. 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.
Correct Answer: C C. Continue on an uncertain position until the next scheduled fix.
Explanation: This is the most appropriate option because it connects the observed D. Make a series of small course changes that are difficult to detect.
condition to the governing requirement and leaves a record of why the decision was made. Correct Answer: A
Explanation: The correct choice follows a verify-act-confirm sequence. That is more
45. A vessel must plan a passage through constrained waters. Which reliable than bypassing controls or making multiple uncontrolled changes.
troubleshooting approach is most appropriate for restricted-water operations?
A. Assume constant bearing is harmless when range is decreasing. 54. The vessel approaches a traffic or pilotage constraint. Under these
B. Silence a machinery alarm and continue at the same load without investigation. conditions, when should the issue involving environmental conditions affecting
C. Use all available means to assess collision risk and take early, substantial action safe navigation be escalated?
consistent with the applicable navigation rules. 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. Cross-check position, traffic and navigation sources before altering the passage
Correct Answer: C plan.
Explanation: The correct choice follows a verify-act-confirm sequence. That is more C. Rely on one electronic source when independent information conflicts.
reliable than bypassing controls or making multiple uncontrolled changes. D. Continue on an uncertain position until the next scheduled fix.
Correct Answer: B
Explanation: The strongest exam-style response is the one that controls immediate risk,
checks the relevant condition, and then acts within the defined requirements for
environmental conditions affecting safe navigation.
3
Exam | Practice Questions & Answers
ID14163
,USCG Chief Mate and Master Mariner License Exam | Practice Questions & Answers
1. A pollution-prevention barrier is found compromised during transfer. With 10. A stability calculation is required after cargo or ballast changes. Which
respect to Pollution prevention, MARPOL principles and environmental protection, action is most likely to prevent recurrence of a problem involving
what is the best FIRST action? distress/urgency procedures?
A. Stop or control the operation, protect personnel and follow the required emergency A. Discharge a small contaminant amount rather than initiating the response procedure.
or pollution-response procedure. B. Verify the loading and stability data before accepting a cargo or ballast change,
B. Continue the transfer until the planned quantity is complete. then confirm that the corrective action is effective before closure.
C. Depart with required safety equipment unavailable because conditions are calm. C. Make an unverified ballast change solely to improve trim.
D. Enter an enclosed space based only on a prior atmosphere test. D. Depart with required safety equipment inoperative because the voyage is short.
Correct Answer: A 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 Pollution performance because it addresses distress/urgency procedures using observable evidence
prevention, MARPOL principles and environmental protection. rather than convenience.
2. Required lifesaving equipment is not ready before departure. Which evidence is 11. A position fix disagrees with the expected track. Which sequence is most
most important when evaluating Pollution prevention? appropriate when carrying out Collision avoidance, maneuvering, pilotage and
A. Enter an enclosed space based only on a prior atmosphere test. restricted-water operations?
B. Wash a small spill overboard rather than initiating the response process. A. Continue on an uncertain position until the next scheduled fix.
C. Depart with required safety equipment unavailable because conditions are calm. B. Use all available means to determine collision risk and take early, substantial
D. Review equipment inventory, inspection status and operational readiness and compare action consistent with the applicable navigation rules, then verify the resulting
the findings with the applicable criteria. state before moving to the next step.
Correct Answer: D C. Assume there is no risk because the other vessel is visually small.
Explanation: The selected action best supports safe, compliant, and technically sound D. Rely on one electronic source when independent information conflicts.
performance because it addresses Pollution prevention using observable evidence rather Correct Answer: B
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
3. A navigation fix does not agree with another available source. Which response
conditions before the cause is understood.
best controls the primary risk associated with MARPOL principles?
A. Use all available means to assess collision risk and take early, substantial action 12. Visibility falls and several targets appear on radar; visibility falls below
consistent with the applicable navigation rules. one nautical mile. Which choice demonstrates the strongest control of Collision
B. Assume constant bearing is harmless when range is decreasing. avoidance?
C. Silence a machinery alarm and continue at the same load without investigation. A. Rely on one electronic source when independent information conflicts.
D. Use a single navigation source after another source shows a material discrepancy. B. Cross-check position, traffic and navigation sources before altering the passage
Correct Answer: A plan.
Explanation: A defensible professional decision should be based on current evidence and C. Make a series of small course changes that are difficult to detect.
applicable criteria. The other choices rely on assumption, remove safeguards, or change D. Assume there is no risk because the other vessel is visually small.
conditions before the cause is understood. Correct Answer: B
Explanation: This is the most appropriate option because it connects the observed
4. A pollution-prevention barrier is found compromised during transfer; a
condition to the governing requirement and leaves a record of why the decision was made.
navigation fix differs by 0.8 nautical mile from another source. Before
proceeding with work involving environmental protection, what should be verified? 13. An engineering watch observes an abnormal temperature or pressure. What is
A. Wash a small spill overboard rather than initiating the response process. required before accepting the result related to restricted-water operations?
B. Enter an enclosed space based only on a prior atmosphere test. A. Silence a machinery alarm and continue at the same load without investigation.
C. Review equipment inventory, inspection status and operational readiness and compare B. Use a single navigation source after another source shows a material discrepancy.
the findings with the applicable criteria. C. Assume constant bearing is harmless when range is decreasing.
D. Continue the transfer until the planned quantity is complete. D. Review machinery pressures, temperatures, alarms and operating limits and compare
Correct Answer: C the findings with the applicable criteria.
Explanation: This is the most appropriate option because it connects the observed Correct Answer: D
condition to the governing requirement and leaves a record of why the decision was made. Explanation: The correct choice follows a verify-act-confirm sequence. That is more
reliable than bypassing controls or making multiple uncontrolled changes.
5. A position fix disagrees with the expected track. Which troubleshooting
approach is most appropriate for STCW competence, drills, records and 14. The vessel approaches a traffic or pilotage constraint. Under these
professional watchkeeping standards? conditions, when should the issue involving Navigation rules, watchkeeping
A. Assume there is no risk because the other vessel is visually small. responsibilities and bridge resource management be escalated?
B. Use all available means to determine collision risk and take early, substantial A. Make a series of small course changes that are difficult to detect.
action consistent with the applicable navigation rules. B. Rely on one electronic source when independent information conflicts.
C. Continue on an uncertain position until the next scheduled fix. C. 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.
Correct Answer: B D. Continue on an uncertain position until the next scheduled fix.
Explanation: The correct choice follows a verify-act-confirm sequence. That is more Correct Answer: C
reliable than bypassing controls or making multiple uncontrolled changes. Explanation: The strongest exam-style response is the one that controls immediate risk,
checks the relevant condition, and then acts within the defined requirements for
6. A deck watch detects a change in bearing to another vessel. Which action best
Navigation rules, watchkeeping responsibilities and bridge resource management.
supports a defensible decision about STCW competence?
A. Correct a required safety-equipment deficiency before sailing when the vessel 15. Visibility falls and several targets appear on radar. Which comparison is
cannot legally or safely depart. most useful for interpreting Navigation rules?
B. Depart with required safety equipment inoperative because the voyage is short. A. Continue on an uncertain position until the next scheduled fix.
C. Discharge a small contaminant amount rather than initiating the response procedure. B. Assume there is no risk because the other vessel is visually small.
D. Make an unverified ballast change solely to improve trim. C. Rely on one electronic source when independent information conflicts.
Correct Answer: A D. Review bearing/range trend, own-ship course/speed, target aspect and applicable
Explanation: The strongest exam-style response is the one that controls immediate risk, rule and compare the findings with the applicable criteria.
checks the relevant condition, and then acts within the defined requirements for STCW Correct Answer: D
competence. Explanation: The correct response protects the integrity of the process: establish the
facts, apply the appropriate control, and verify the result before closure.
7. Visibility falls and several targets appear on radar. A change affecting
professional watchkeeping standards is being considered. How should it be 16. Visibility falls and several targets appear on radar; a target bearing
handled? remains nearly constant as range decreases. Which action best distinguishes the
A. Continue on an uncertain position until the next scheduled fix. underlying cause from a symptom in watchkeeping responsibilities?
B. Assume there is no risk because the other vessel is visually small. A. Cross-check position, traffic and navigation sources before altering the passage
C. Rely on one electronic source when independent information conflicts. plan, then confirm that the corrective action is effective before closure.
D. Use all available means to determine collision risk and take early, substantial B. Rely on one electronic source when independent information conflicts.
action consistent with the applicable navigation rules. C. Make a series of small course changes that are difficult to detect.
Correct Answer: D D. Assume there is no risk because the other vessel is visually small.
Explanation: The correct response protects the integrity of the process: establish the Correct Answer: A
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 watchkeeping
8. A deck watch detects a change in bearing to another vessel; a target bearing
responsibilities.
remains nearly constant as range decreases. The abnormal condition directly
affects Communications, GMDSS awareness and distress/urgency procedures. What is 17. A vessel approaches restricted visibility with traffic nearby. Which response
the most appropriate response? is most consistent with the professional or compliance requirements governing
A. Make an unverified ballast change solely to improve trim. bridge resource management?
B. Correct a required safety-equipment deficiency before sailing when the vessel A. Use a single navigation source after another source shows a material discrepancy.
cannot legally or safely depart. B. Assume constant bearing is harmless when range is decreasing.
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. Discharge a small contaminant amount rather than initiating the response procedure. consistent with the applicable navigation rules.
Correct Answer: B D. Silence a machinery alarm and continue at the same load without investigation.
Explanation: This approach preserves control of the situation while producing evidence Correct Answer: C
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.
9. A vessel must plan a passage through constrained waters. Which documentation
approach best supports traceability for GMDSS awareness? 18. An alarm occurs during machinery operation. Which handoff practice best
A. Assume constant bearing is harmless when range is decreasing. reduces error risk for Chartwork, publications, voyage planning and position
B. Record the observed condition, supporting evidence, decision and responsible fixing?
follow-up; communicate any unresolved risk to the next responsible person. A. Depart with required safety equipment inoperative because the voyage is short.
C. Silence a machinery alarm and continue at the same load without investigation. B. Record the observed condition, supporting evidence, decision and responsible
D. Use a single navigation source after another source shows a material discrepancy. follow-up; communicate any unresolved risk to the next responsible person.
Correct Answer: B C. Discharge a small contaminant amount rather than initiating the response procedure.
Explanation: This answer uses verified evidence before action, which reduces the chance D. Make an unverified ballast change solely to improve trim.
of masking the real problem and supports a traceable decision about GMDSS awareness. Correct Answer: B
Explanation: The selected action best supports safe, compliant, and technically sound
performance because it addresses Chartwork, publications, voyage planning and position
fixing using observable evidence rather than convenience.
1
,USCG Chief Mate and Master Mariner License Exam | Practice Questions & Answers
19. A vessel approaches restricted visibility with traffic nearby. Which decision 28. A navigation fix does not agree with another available source; the vessel
about voyage planning is best supported by the available evidence? draft increases after cargo loading. The abnormal condition directly affects
A. Silence a machinery alarm and continue at the same load without investigation. hazards relevant to vessel type. What is the most appropriate response?
B. Use all available means to assess collision risk and take early, substantial action A. Discharge a small contaminant amount rather than initiating the response procedure.
consistent with the applicable navigation rules. B. Make an unverified ballast change solely to improve trim.
C. Use a single navigation source after another source shows a material discrepancy. C. Depart with required safety equipment inoperative because the voyage is short.
D. Assume constant bearing is harmless when range is decreasing. D. Correct a required safety-equipment deficiency before sailing when the vessel
Correct Answer: B cannot legally or safely depart.
Explanation: A defensible professional decision should be based on current evidence and Correct Answer: D
applicable criteria. The other choices rely on assumption, remove safeguards, or change Explanation: This is the most appropriate option because it connects the observed
conditions before the cause is understood. condition to the governing requirement and leaves a record of why the decision was made.
20. A vessel must plan a passage through constrained waters; visibility falls 29. An enclosed-space task is proposed without a completed entry check. Which
below one nautical mile. Which review step adds the most value before closing documentation approach best supports traceability for Marine safety systems,
work involving position fixing? lifesaving appliances and emergency procedures?
A. Make an unverified ballast change solely to improve trim. A. Continue the transfer until the planned quantity is complete.
B. Depart with required safety equipment inoperative because the voyage is short. B. Depart with required safety equipment unavailable because conditions are calm.
C. Discharge a small contaminant amount rather than initiating the response procedure. C. Enter an enclosed space based only on a prior atmosphere test.
D. Verify the loading and stability data before accepting a cargo or ballast change, D. 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.
Correct Answer: D Correct Answer: D
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.
21. A position fix disagrees with the expected track. With respect to 30. Required lifesaving equipment is not ready before departure. Which action is
Meteorology, tides, currents and environmental conditions affecting safe most likely to prevent recurrence of a problem involving Marine safety systems?
navigation, what is the best FIRST action? A. Enter an enclosed space based only on a prior atmosphere test.
A. Use all available means to determine collision risk and take early, substantial B. Wash a small spill overboard rather than initiating the response process.
action consistent with the applicable navigation rules. C. Depart with required safety equipment unavailable because conditions are calm.
B. Assume there is no risk because the other vessel is visually small. D. Correct a required safety-equipment deficiency and verify readiness before
C. Continue on an uncertain position until the next scheduled fix. proceeding, then confirm that the corrective action is effective before closure.
D. Make a series of small course changes that are difficult to detect. Correct Answer: D
Correct Answer: A 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 Marine
reliable than bypassing controls or making multiple uncontrolled changes. safety systems.
22. The vessel approaches a traffic or pilotage constraint. Which evidence is 31. An alarm occurs during machinery operation. Which sequence is most
most important when evaluating environmental conditions affecting safe appropriate when carrying out lifesaving appliances?
navigation? A. Cross-check navigation sources and resolve a position discrepancy before relying on
A. Make a series of small course changes that are difficult to detect. the fix, then verify the resulting state before moving to the next step.
B. Rely on one electronic source when independent information conflicts. B. Silence a machinery alarm and continue at the same load without investigation.
C. Review position sources, charted hazards, depth/under-keel clearance and traffic C. Use a single navigation source after another source shows a material discrepancy.
and compare the findings with the applicable criteria. D. Assume constant bearing is harmless when range is decreasing.
D. Continue on an uncertain position until the next scheduled fix. Correct Answer: A
Correct Answer: C Explanation: The correct response protects the integrity of the process: establish the
Explanation: The strongest exam-style response is the one that controls immediate risk, facts, apply the appropriate control, and verify the result before closure.
checks the relevant condition, and then acts within the defined requirements for
environmental conditions affecting safe navigation.
32. An enclosed-space task is proposed without a completed entry check;
visibility falls below one nautical mile. Which choice demonstrates the strongest
23. A slack tank creates additional free-surface effect. Which response best control of emergency procedures?
controls the primary risk associated with Ship stability, trim, loading and basic A. Wash a small spill overboard rather than initiating the response process.
stability calculations? B. Enter an enclosed space based only on a prior atmosphere test.
A. Move heavy cargo higher to free lower deck space without recalculation. C. Correct a required safety-equipment deficiency and verify readiness before
B. Correct a list by moving weight without checking stability impact. proceeding.
C. Recalculate the relevant stability condition before accepting the loading or D. Continue the transfer until the planned quantity is complete.
ballast change. Correct Answer: C
D. Accept a loading condition based only on even draft readings. Explanation: This approach preserves control of the situation while producing evidence
Correct Answer: C that can confirm whether the action actually corrected the issue involving emergency
Explanation: The correct response protects the integrity of the process: establish the procedures.
facts, apply the appropriate control, and verify the result before closure.
33. A pollution-prevention barrier is found compromised during transfer. What is
24. Cargo loading changes the vessel's vertical center of gravity; a navigation required before accepting the result related to Pollution prevention, MARPOL
fix differs by 0.8 nautical mile from another source. Before proceeding with work principles and environmental protection?
involving Ship stability, what should be verified? A. Continue the transfer until the planned quantity is complete.
A. Accept a loading condition based only on even draft readings. B. Depart with required safety equipment unavailable because conditions are calm.
B. Ignore slack-tank effects because total liquid weight is unchanged. C. Enter an enclosed space based only on a prior atmosphere test.
C. Correct a list by moving weight without checking stability impact. D. Review source/quantity of release, containment condition, notifications and
D. Review loading manual limits, free-surface moment and resulting draft/trim and response equipment and compare the findings with the applicable criteria.
compare the findings with the applicable criteria. Correct Answer: D
Correct Answer: D Explanation: This answer uses verified evidence before action, which reduces the chance
Explanation: This approach preserves control of the situation while producing evidence of masking the real problem and supports a traceable decision about Pollution
that can confirm whether the action actually corrected the issue involving Ship prevention, MARPOL principles and environmental protection.
stability.
34. Required lifesaving equipment is not ready before departure. Under these
25. A slack tank creates additional free-surface effect. Which troubleshooting conditions, when should the issue involving Pollution prevention be escalated?
approach is most appropriate for basic stability calculations? A. Enter an enclosed space based only on a prior atmosphere test.
A. Correct a list by moving weight without checking stability impact. B. Wash a small spill overboard rather than initiating the response process.
B. Move heavy cargo higher to free lower deck space without recalculation. C. Depart with required safety equipment unavailable because conditions are calm.
C. Recalculate the relevant stability condition before accepting the loading or D. Correct a required safety-equipment deficiency and verify readiness before
ballast change. proceeding.
D. Ignore slack-tank effects because total liquid weight is unchanged. Correct Answer: D
Correct Answer: C 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 Pollution prevention using observable evidence rather
of masking the real problem and supports a traceable decision about basic stability than convenience.
calculations.
35. A vessel approaches restricted visibility with traffic nearby. Which
26. A deck load is shifted to a higher position. Which action best supports a comparison is most useful for interpreting MARPOL principles?
defensible decision about Cargo operations, stowage, securing and hazards A. Use a single navigation source after another source shows a material discrepancy.
relevant to vessel type? B. Review weather, tide/current, under-keel clearance and route hazards and compare
A. Ignore slack-tank effects because total liquid weight is unchanged. the findings with the applicable criteria.
B. Account for free-surface and weight-shift effects when evaluating stability and C. Assume constant bearing is harmless when range is decreasing.
trim. D. Silence a machinery alarm and continue at the same load without investigation.
C. Accept a loading condition based only on even draft readings. Correct Answer: B
D. Move heavy cargo higher to free lower deck space without recalculation. Explanation: A defensible professional decision should be based on current evidence and
Correct Answer: B applicable criteria. The other choices rely on assumption, remove safeguards, or change
Explanation: The selected action best supports safe, compliant, and technically sound conditions before the cause is understood.
performance because it addresses Cargo operations, stowage, securing and hazards
36. A pollution-prevention barrier is found compromised during transfer; a target
relevant to vessel type using observable evidence rather than convenience.
bearing remains nearly constant as range decreases. Which action best
27. Ballast is proposed to correct a list. A change affecting Cargo operations is distinguishes the underlying cause from a symptom in environmental protection?
being considered. How should it be handled? A. Correct a required safety-equipment deficiency and verify readiness before
A. Move heavy cargo higher to free lower deck space without recalculation. proceeding, then confirm that the corrective action is effective before closure.
B. Correct a list by moving weight without checking stability impact. B. Wash a small spill overboard rather than initiating the response process.
C. Accept a loading condition based only on even draft readings. C. Enter an enclosed space based only on a prior atmosphere test.
D. Recalculate the relevant stability condition before accepting the loading or D. Continue the transfer until the planned quantity is complete.
ballast change. Correct Answer: A
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.
2
, USCG Chief Mate and Master Mariner License Exam | Practice Questions & Answers
37. A position fix disagrees with the expected track. Which response is most 46. The vessel approaches a traffic or pilotage constraint. Which action best
consistent with the professional or compliance requirements governing STCW supports a defensible decision about Navigation rules, watchkeeping
competence, drills, records and professional watchkeeping standards? responsibilities and bridge resource management?
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. Use all available means to determine collision risk and take early, substantial plan.
action consistent with the applicable navigation rules. C. Rely on one electronic source when independent information conflicts.
D. Make a series of small course changes that are difficult to detect. D. Continue on an uncertain position until the next scheduled fix.
Correct Answer: C 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
Navigation rules, watchkeeping responsibilities and bridge resource management.
38. An engineering watch observes an abnormal temperature or pressure. Which
handoff practice best reduces error risk for STCW competence? 47. Visibility falls and several targets appear on radar. A change affecting
A. Make an unverified ballast change solely to improve trim. Navigation rules is being considered. How should it be handled?
B. Depart with required safety equipment inoperative because the voyage is short. A. Use all available means to determine collision risk and take early, substantial
C. Discharge a small contaminant amount rather than initiating the response procedure. action consistent with the applicable navigation rules.
D. Record the observed condition, supporting evidence, decision and responsible B. Continue on an uncertain position until the next scheduled fix.
follow-up; communicate any unresolved risk to the next responsible person. C. Assume there is no risk because the other vessel is visually small.
Correct Answer: D D. Rely on one electronic source when independent information conflicts.
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 STCW Explanation: The correct response protects the integrity of the process: establish the
competence. facts, apply the appropriate control, and verify the result before closure.
39. Visibility falls and several targets appear on radar. Which decision about 48. Visibility falls and several targets appear on radar; the vessel draft
professional watchkeeping standards is best supported by the available evidence? increases after cargo loading. The abnormal condition directly affects
A. Continue on an uncertain position until the next scheduled fix. watchkeeping responsibilities. What is the most appropriate response?
B. Use all available means to determine collision risk and take early, substantial A. Rely on one electronic source when independent information conflicts.
action consistent with the applicable navigation rules. B. Make a series of small course changes that are difficult to detect.
C. Assume there is no risk because the other vessel is visually small. C. Cross-check position, traffic and navigation sources before altering the passage
D. Rely on one electronic source when independent information conflicts. plan.
Correct Answer: B D. Assume there is no risk because the other vessel is visually small.
Explanation: The correct response protects the integrity of the process: establish the Correct Answer: C
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 watchkeeping
40. An engineering watch observes an abnormal temperature or pressure; the vessel responsibilities.
draft increases after cargo loading. Which review step adds the most value before
closing work involving Communications, GMDSS awareness and distress/urgency 49. A stability calculation is required after cargo or ballast changes. Which
procedures? documentation approach best supports traceability for bridge resource management?
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. 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. Depart with required safety equipment inoperative because the voyage is short. D. Assume constant bearing is harmless when range is decreasing.
Correct Answer: C Correct Answer: C
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 of masking the real problem and supports a traceable decision about bridge resource
Communications, GMDSS awareness and distress/urgency procedures. management.
41. A towing or deck operation is affected by changing weather. With respect to 50. A navigation fix does not agree with another available source. Which action
GMDSS awareness, what is the best FIRST action? is most likely to prevent recurrence of a problem involving Chartwork,
A. Use a single navigation source after another source shows a material discrepancy. publications, voyage planning and position fixing?
B. Use all available means to assess collision risk and take early, substantial action A. Make an unverified ballast change solely to improve trim.
consistent with the applicable navigation rules. B. Depart with required safety equipment inoperative because the voyage is short.
C. Assume constant bearing is harmless when range is decreasing. C. Discharge a small contaminant amount rather than initiating the response procedure.
D. Silence a machinery alarm and continue at the same load without investigation. D. Verify the loading and stability data before accepting a cargo or ballast change,
Correct Answer: B then confirm that the corrective action is effective before closure.
Explanation: This answer uses verified evidence before action, which reduces the chance Correct Answer: D
of masking the real problem and supports a traceable decision about GMDSS awareness. Explanation: The selected action best supports safe, compliant, and technically sound
performance because it addresses Chartwork, publications, voyage planning and position
42. A pre-departure check identifies a safety-equipment deficiency. Which fixing using observable evidence rather than convenience.
evidence is most important when evaluating distress/urgency procedures?
A. Depart with required safety equipment inoperative because the voyage is short. 51. A stability calculation is required after cargo or ballast changes. Which
B. Discharge a small contaminant amount rather than initiating the response procedure. sequence is most appropriate when carrying out voyage planning?
C. 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. Use all available means to assess collision risk and take early, substantial action
D. Make an unverified ballast change solely to improve trim. consistent with the applicable navigation rules, then verify the resulting state
Correct Answer: C before moving to the next step.
Explanation: The selected action best supports safe, compliant, and technically sound C. Silence a machinery alarm and continue at the same load without investigation.
performance because it addresses distress/urgency procedures using observable evidence D. Use a single navigation source after another source shows a material discrepancy.
rather than convenience. Correct Answer: B
Explanation: A defensible professional decision should be based on current evidence and
43. A position fix disagrees with the expected track. Which response best applicable criteria. The other choices rely on assumption, remove safeguards, or change
controls the primary risk associated with Collision avoidance, maneuvering, conditions before the cause is understood.
pilotage and restricted-water operations?
A. Continue on an uncertain position until the next scheduled fix. 52. A towing or deck operation is affected by changing weather; a machinery
B. Use all available means to determine collision risk and take early, substantial temperature rises 20 C above its normal trend. Which choice demonstrates the
action consistent with the applicable navigation rules. strongest control of position fixing?
C. Assume there is no risk because the other vessel is visually small. A. Discharge a small contaminant amount rather than initiating the response procedure.
D. Rely on one electronic source when independent information conflicts. B. Correct a required safety-equipment deficiency before sailing when the vessel
Correct Answer: B cannot legally or safely depart.
Explanation: A defensible professional decision should be based on current evidence and C. Make an unverified ballast change solely to improve trim.
applicable criteria. The other choices rely on assumption, remove safeguards, or change D. Depart with required safety equipment inoperative because the voyage is short.
conditions before the cause is understood. Correct Answer: B
Explanation: This is the most appropriate option because it connects the observed
44. Visibility falls and several targets appear on radar; a machinery temperature condition to the governing requirement and leaves a record of why the decision was made.
rises 20 C above its normal trend. Before proceeding with work involving
Collision avoidance, what should be verified? 53. A position fix disagrees with the expected track. What is required before
A. Rely on one electronic source when independent information conflicts. accepting the result related to Meteorology, tides, currents and environmental
B. Make a series of small course changes that are difficult to detect. conditions affecting safe navigation?
C. Review position sources, charted hazards, depth/under-keel clearance and traffic A. Review bearing/range trend, own-ship course/speed, target aspect and applicable
and compare the findings with the applicable criteria. rule and compare the findings with the applicable criteria.
D. 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.
Correct Answer: C C. Continue on an uncertain position until the next scheduled fix.
Explanation: This is the most appropriate option because it connects the observed D. Make a series of small course changes that are difficult to detect.
condition to the governing requirement and leaves a record of why the decision was made. Correct Answer: A
Explanation: The correct choice follows a verify-act-confirm sequence. That is more
45. A vessel must plan a passage through constrained waters. Which reliable than bypassing controls or making multiple uncontrolled changes.
troubleshooting approach is most appropriate for restricted-water operations?
A. Assume constant bearing is harmless when range is decreasing. 54. The vessel approaches a traffic or pilotage constraint. Under these
B. Silence a machinery alarm and continue at the same load without investigation. conditions, when should the issue involving environmental conditions affecting
C. Use all available means to assess collision risk and take early, substantial action safe navigation be escalated?
consistent with the applicable navigation rules. 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. Cross-check position, traffic and navigation sources before altering the passage
Correct Answer: C plan.
Explanation: The correct choice follows a verify-act-confirm sequence. That is more C. Rely on one electronic source when independent information conflicts.
reliable than bypassing controls or making multiple uncontrolled changes. D. Continue on an uncertain position until the next scheduled fix.
Correct Answer: B
Explanation: The strongest exam-style response is the one that controls immediate risk,
checks the relevant condition, and then acts within the defined requirements for
environmental conditions affecting safe navigation.
3
