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Which answer is consistent with Rule 19 — Conduct of Vessels in Restricted Visibility?
A
Not just a literal whistle — any Annex III compliant horn, siren or foghorn qualifies.
B
Avoid the instinctive port alteration for a radar target forward of the beam.
C
Gong's tone must NOT be confusable with the bell's.
D
One short blast means starboard, two means port, three means astern propulsion, and five or more rapid blasts mean doubt or danger.