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Under Rule 19 — Conduct of Vessels in Restricted Visibility, what should a navigator remember?
A
NUC: two red all-round lights vertically (day: two balls).
B
A vessel constrained by draught may display three all-round red lights in a vertical line, or a cylinder day shape.
C
In restricted visibility, vessels detected by radar alone must take avoiding action in ample time.
D
Normal navigation lights (sidelights, sternlight) when underway.