Question 1

Rule 20 sets out when the rules concerning lights apply. When must the prescribed lights be exhibited?

Accepted Answer

From sunset to sunrise, during which time no other lights shall be exhibited except such lights as cannot be mistaken for the prescribed lights or do not impair their visibility/distinctive character — and the prescribed lights shall also be exhibited from sunrise to sunset in restricted visibility, and may be exhibited in all other circumstances when deemed necessary Rule 20 establishes the core timing requirement (sunset to sunrise, plus restricted visibility during daylight) and also restricts the display of other lights that could be confused with the prescribed navigation lights — and explicitly allows showing prescribed lights at other times if considered necessary.

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.