International Maritime Regulations

COLREG — Regulations for Preventing Collisions at Sea

This test assesses your basic understanding of the International Regulations for Preventing Collisions at Sea (COLREG). The focus is on general definitions, allocation of responsibilities between vessels, principles of safe navigation, and actions in different situations. Navigation lights and day shapes are not included in this module, as they are covered separately.

Questions 15

Time Limit 9 min

Language English

Sample Questions

Here are some example questions from this quiz. Download the GYRO app to take the full test.

Question 1

You are on a power-driven vessel. A sailing vessel is approaching on a steady bearing from your starboard side. What must you do?

A Alter course to avoid collision.

B Maintain course and speed.

C Sound five short blasts.

D Wait for the sailing vessel to maneuver.

Question 2

Under Rule 10, a vessel restricted in her ability to manoeuvre when engaged in an operation for the maintenance of safety of navigation in TSS :

A May use the TSS but must not impede other traffic unnecessarily.

B May use any part of the TSS freely.

C Shall avoid traffic lanes whenever possible.

D Is exempt from Rule 10 to the extent necessary to carry out the operation.

Question 3

Which of the following situations could justify deviation from COLREGs under Rule 2(b)?

A Sudden rudder failure during overtaking.

B Dense fog with icebergs present.

C Loss of power in heavy traffic.

D Routine watch handover.

Question 4

You are the stand-on vessel. The give-way vessel is not taking action and CPA is decreasing rapidly. What must you do?

A Take action to avoid collision if it becomes apparent that the give-way vessel is not acting.

B Maintain course and speed no matter what.

C Begin a sequence of sound signals.

D Immediately stop engines.

Question 5

“Any alteration of course and/or speed to avoid collision shall be large enough to be readily apparent to another vessel ________.”

A visually or by radar.

B by radar.

C in close-range conditions only.

D from more than 2 NM away.

COLREG — Regulations for Preventing Collisions at Sea

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