Question 1

Under Annex III, a whistle fitted to a vessel of 200 metres or more in length must have a range of audibility of at least 2 nautical miles, while a whistle fitted to a vessel of less than 20 metres need only be audible for at least 0.5 of a nautical mile.

Accepted Answer

True True. Annex III, paragraph 1 scales the minimum audibility range with vessel size - 2 nm for 200m+, down to 0.5 nm for vessels under 20m - reflecting that smaller vessels operate at closer quarters and pose a shorter-range collision risk that a quieter whistle can still adequately warn against.

Question 2

Rule 5 (Look-out) requires every vessel at all times to maintain a proper look-out by sight and hearing, as well as by all available means appropriate in the prevailing circumstances and conditions — and this duty applies even when the vessel is at anchor in a busy anchorage.

Accepted Answer

True True. Rule 5 applies 'at all times' and to 'every vessel'. A vessel at anchor in a busy anchorage still needs an effective look-out to detect drifting vessels, dragging anchors, or approaching traffic that may pose a risk of collision or contact.

Question 3

Under Rule 6 (Safe Speed), a vessel fitted with a fully operational radar and ARPA never needs to reduce speed in restricted visibility, because the equipment guarantees early detection of other vessels.

Accepted Answer

False False. Rule 6 explicitly lists radar capability as one factor to consider, but also requires accounting for the state of visibility, traffic density, manoeuvrability, and the limitations of radar (range scale, sea/rain clutter, blind sectors). Even a vessel with excellent radar must proceed at a speed that allows proper and effective action to avoid collision and to be stopped within a distance appropriate to the prevailing circumstances.