Question 1

Rule 17(b) addresses the situation where the stand-on vessel finds herself so close that collision cannot be avoided by the give-way vessel's action alone. What does this sub-rule require?

Accepted Answer

She shall take such action as will best aid to avoid collision — i.e. whatever manoeuvre (course and/or speed) most effectively reduces or removes the risk, given the immediate circumstances, rather than being constrained to "maintain course and speed" Rule 17(b) is the final stage of the graduated stand-on vessel response — once it is too late for the give-way vessel's action alone to suffice, the stand-on vessel must do whatever best helps avoid collision, with Rule 17(c)'s caution about to-port alterations still informing the choice where applicable.

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.