Question 1

Rule 20 (Application, Part C — Lights and Shapes) requires lights to be exhibited from sunset to sunrise, and during that time no other lights may be shown that could be mistaken for the prescribed lights or impair their visibility or distinctive character.

Accepted Answer

True True. Rule 20 also requires that the prescribed lights, where fitted, are exhibited from sunrise to sunset in restricted visibility and may be exhibited in all other circumstances when deemed necessary — but the core sunset-to-sunrise requirement, and the prohibition on lights that could be confused with or degrade the prescribed lights, is foundational and worth stating precisely rather than paraphrasing loosely.

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.