Maritime and Marine Navigation Rules (COLREGS)

Question 1

Under the International Rules (COLREGS), what does a vessel display when she is not under command?

Accepted Answer

Two all-round red lights in a vertical line

Answer

A vessel not under command shows two all-round red lights in a vertical line under COLREGS Rule 27.

Question 2

Which navigation rule applies when two power-driven vessels meet head-on?

Accepted Answer

Both vessels must alter course to starboard

Answer

Rule 14 requires both vessels in a head-on situation to alter course to starboard so each passes on the port side of the other.

Question 3

What is the minimum visible range required for a masthead light on a vessel 50 meters or more in length?

Accepted Answer

6 miles

Answer

COLREGS Annex I requires masthead lights on vessels 50 meters or more to be visible for at least 6 nautical miles.

Question 4

Under COLREGS, what sound signal does a power-driven vessel make when altering course to starboard?

Accepted Answer

One short blast

Answer

Rule 34 states one short blast signals intent to alter course to starboard.

Question 5

A sailing vessel underway is overtaking a power-driven vessel. Which vessel is the stand-on vessel?

Accepted Answer

The power-driven vessel being overtaken

Answer

Rule 13 states that any vessel overtaking another must keep clear, regardless of the type of vessel being overtaken.

Maritime and Marine Practice Test