Question 1

Rule 7 (Risk of Collision) states that "if there is any doubt, such risk shall be deemed to exist." What practical guidance does the rule also give about assumptions made on the basis of scanty information?

Accepted Answer

Assumptions shall not be made on the basis of scanty information, especially scanty radar information — encouraging proper use of radar (plotting, ranges and bearings of contacts) rather than snap judgements from a brief glance Rule 7(c) specifically warns against assumptions from scanty information (especially scanty radar information) — a brief or partial radar picture can be misleading, and proper systematic observation/plotting is required before concluding there is no risk.

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.