U.S. COLREGs Practical Navigation Quiz

US COLREGs Practical Situational Quiz

Tests your ability to apply U.S. Navigation Inland Rules in realistic situations involving vessel encounters, watchkeeping, signals, and collision avoidance.

 

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#1. Under Rule 2(b), what consideration authorizes a watchkeeper or master to depart from the COLREGs?

#2. You are the watchkeeper on a power-driven vessel. In sight of another vessel, you put your propulsion machinery full astern to avoid collision. Under Rule 34(a), what sound signal must you sound?

#3. You are navigating in fog and detect a radar contact 15 degrees abaft your port beam at 3 nautical miles, closing range. Under Rule 19(d)(ii), which course alteration should you avoid so far as possible?

#4. While on watch in clear weather, you observe a vessel approaching displaying two black balls in a vertical line. What does this mean, and what is your action?

#5. During your watch, your vessel is overtaking a power-driven vessel on her starboard quarter. As your bow draws abeam of her, the relative bearing shifts forward of her beam. Does this bearing shift relieve you of your duty to keep clear under Rule 13(d)?

#6. You are the OOW on a stand-on vessel in a crossing situation. The give-way vessel on your port bow has closed to 3 nautical miles and is maintaining course and speed. Compass bearings are perfectly steady. What is your immediate obligation?

#7. You are navigating in fog and hear forward of your beam a whistle signal of one prolonged blast followed by two short blasts at 2-minute intervals. Which vessel does this identify under Rule 35(c)?

#8. You are watchkeeping on an underway vessel at night. You observe a vessel displaying two all-round lights in a vertical line at the masthead: red over white, along with sidelights and sternlight. What vessel is this under Rule 26(c)?

#9. You are proceeding in dense fog on U.S. inland waters and hear two prolonged blasts sounded every two minutes from an unseen vessel. What does this signal communicate under Rule 35(b)?

#10. You are navigating a 100-meter cargo vessel in heavy fog and come to anchor in a designated anchorage. Under Rule 35(g), what sound signals must your bridge team ensure are sounded?

#11. You are navigating on inland waters and encounter a vessel exhibiting three all-round red lights in a vertical line at night. What regulatory conclusion should you reach regarding this display?

#12. You are the OOW on an underway power-driven vessel. Ahead, you sight a vessel displaying three day shapes in a vertical line: a black ball at the top, a black diamond in the middle, and a black ball at the bottom. What category does this vessel represent and what is your obligation?

#13. You are navigating in fog and detect on radar a vessel dead ahead at 3 nautical miles closing rapidly. You have not established visual contact and hear no sound signals. Under Rule 19(d), which action is appropriate?

#14. You are the watchkeeper on a stand-on vessel in a crossing encounter. The give-way vessel on your port bow has closed to 0.7 nautical miles without altering course. Collision cannot be avoided by give-way action alone. Under Rule 17(b), what is your duty?

#15. You are navigating a 60-meter vessel at anchor in an open roadstead at night. What lights are you required to display under Rule 30(a) and (b)?

#16. You are the OOW on a vessel in clear weather. You observe a power-driven vessel on your port bow crossing from left to right. Her bearing is drawing forward and range is opening rapidly. What does Rule 7 indicate regarding risk of collision?

#17. You are on watch in fog and detect a contact on radar on your port quarter at 2 nautical miles, moving faster and overtaking your vessel. Under Rule 19(d)(i), are you permitted to alter course to port to increase separation?

#18. You are the OOW on a 120-meter cargo vessel that has run aground in restricted visibility. What sound signal must you sound under Rule 35(h)?

#19. You are conning a downbound power-driven vessel with a following current on the Western Rivers. You encounter an upbound vessel in a narrow river reach. Under Inland Rule 14(d), what is your legal right and obligation?

#20. You are the watchkeeper on a vessel proceeding along a narrow channel or fairway. According to Rule 9(a), where should your vessel position herself?

#21. You are the watchkeeper on a power-driven vessel. At night you sight a single white light and no sidelights at 3 nautical miles fine on your bow. Radar confirms range is closing rapidly. What should you conclude?

#22. During your night watch, you observe a vessel exhibiting two all-round lights in a vertical line at the masthead, white over red, along with sidelights and sternlight. What vessel is this under Rule 29(a)?

#23. While navigating in coastal waters, you observe a vessel displaying three all-round lights in a vertical line: green over white over green. What special operation is she conducting under Rule 26 and Annex II?

#24. While navigating along the coast, you observe a vessel exhibiting three all-round lights in a vertical line: red over white over red. She is also displaying two all-round red lights vertically on her port side and two all-round green lights vertically on her starboard side. On which side should you pass?

#25. You are navigating a 200-meter container ship in an adopted Traffic Separation Scheme. A 16-meter sailing vessel is tacking across your traffic lane dead ahead, creating a close-quarters hazard. What rule governs her action relative to your vessel?

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