Question 1

You are on lookout at night and see two white masthead lights, one above and ahead of the other, plus a green sidelight. The vessel is:

Accepted Answer

A power-driven vessel showing her starboard side, crossing from your port side. A green sidelight shows the vessel's starboard side, consistent here with a power-driven vessel crossing from your port side. Under Rule 23, a power-driven vessel of 50 m or more must show two masthead lights, with the after light higher than the forward one; a vessel under 50 m may also show the second light, so two masthead lights do not prove her length. Assess the bearing and risk of collision. If two power-driven vessels are crossing with collision risk and she is on your port side, she must give way under Rule 15.

Question 2

A vessel of less than 50m at anchor at night shows:

Accepted Answer

One all-round white light where it can best be seen. Rule 30(a)(i): a vessel at anchor shall exhibit one all-round white light where it can best be seen, and may exhibit a second aft. Vessels 50m or more must show two: one forward and one near the stern at a lower level (Rule 30(b)). Day shape: one ball forward.

Question 3

At night you see two all-round red lights in a vertical line and no other lights. The vessel is:

Accepted Answer

Not under command and not making way. Rule 27(a): a vessel not under command shows two all-round red lights in a vertical line where they can best be seen, plus, when making way, sidelights and a sternlight. With NO sidelights or sternlight visible, she is NUC and not making way through the water. Day shape: two black balls.

Watchkeeping, questions and explanations

You are on lookout at night and see two white masthead lights, one above and ahead of the other, plus a green sidelight. The vessel is:

A vessel of less than 50m at anchor at night shows:

At night you see two all-round red lights in a vertical line and no other lights. The vessel is:

Practise this properly

Watchkeeping, questions and explanations

Questions

You are on lookout at night and see two white masthead lights, one above and ahead of the other, plus a green sidelight. The vessel is:

A vessel of less than 50m at anchor at night shows:

At night you see two all-round red lights in a vertical line and no other lights. The vessel is:

Practise this properly