Question 1

How does Rule 3 define a vessel "restricted in her ability to manoeuvre"?

Accepted Answer

A vessel which, from the nature of her work, is restricted in her ability to manoeuvre as required by the Rules, and is therefore unable to keep out of the way of another vessel — examples given include vessels engaged in laying/servicing a navigational mark, dredging, underwater operations, replenishment underway, launching/recovering aircraft, minesweeping, or towing such that the towing vessel and tow cannot readily deviate Rule 3(g) gives a non-exhaustive list of examples — the common thread is that the nature of the work being undertaken restricts manoeuvrability, distinguishing this category from "not under command" (a vessel unable to manoeuvre due to some exceptional circumstance, e.g. mechanical 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.