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Under Rule 19 — Conduct of Vessels in Restricted Visibility, what should a navigator remember?
A
≥ 12 m: whistle required.
B
Every vessel shall have due regard to the prevailing circumstances and conditions of restricted…
C
The whistle, bell and gong shall comply with the specifications of Annex III.
D
A single prolonged blast warns of a blind bend or obstruction in a channel.