Rules of the Road · Restricted Visibility Signals
A pilot vessel on duty in restricted visibility may sound which additional identity signal on the whistle?
- AThree short blasts
- BFour short blasts✓ Correct
- CTwo prolonged blasts
- DOne prolonged followed by one short blast
Explanation
Rule 35(i) states that a pilot vessel on pilotage duty may, in addition to the prescribed fog signals for power-driven vessels or sailing vessels, sound an identity signal of four short blasts. This supplement lets other mariners identify the vessel as a pilot boat even in zero visibility.
Authority: 72 COLREGS Rule 35(i)
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