Question 1

How does Rule 3 define a vessel "not under command"?

Accepted Answer

A vessel which, through some exceptional circumstance, is unable to manoeuvre as required by the Rules and is therefore unable to keep out of the way of another vessel — for example, due to a mechanical failure such as loss of steering or propulsion Rule 3(f) ties "not under command" to an exceptional circumstance (typically a breakdown of steering or propulsion) — distinguishing it from "restricted in ability to manoeuvre," which relates to the nature of planned work rather than a failure.

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.