Question 1

A sailing vessel is also using her engine to make way (i.e. motor-sailing). What lights must she show under Rule 25?

Accepted Answer

She must show the lights prescribed for a power-driven vessel (Rule 23), since Rule 25(e) requires a vessel under sail which is also being propelled by machinery to be regarded as a power-driven vessel for lighting purposes — typically by showing a forward all-round or masthead light shape/light in addition to sail lighting Rule 25(e) treats a motor-sailing vessel as a power-driven vessel for lighting purposes — she must show the lights for a power-driven vessel (which includes a masthead light), reflecting that her manoeuvring characteristics are now those of a powered vessel, not a sailing vessel.

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.