Question 1

You are in command during a transit of a Traffic Separation Scheme (TSS) in poor visibility, with several vessels showing on radar at varying ranges and bearings. What command-level considerations apply beyond the basic COLREGS rules for TSS use (Rule 10)?

Accepted Answer

Rule 10 continues to apply in restricted visibility (proceeding in the appropriate traffic lane, at a safe speed for the conditions per Rule 6 and Rule 19, with enhanced lookout including radar plotting/ARPA to assess multiple contacts, and being prepared to take early and substantial action under Rule 19 if a close-quarters situation develops) Rule 10 (TSS) applies regardless of visibility, and in restricted visibility Rule 19 governs action to avoid collision — combined, this means continued lane discipline, safe speed appropriate to conditions and traffic density, and proactive use of radar/ARPA to manage multiple contacts, with early action if risk develops.

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.