Rules of the Road · Restricted Visibility Signals
An anchored vessel wishing to warn an approaching vessel in fog may supplement the bell signal with which optional whistle signal?
- AOne prolonged blast
- BTwo prolonged blasts
- COne short, one prolonged, and one short blast on the whistle✓ Correct
- DFive short blasts
Explanation
Rule 35(g) permits an anchored vessel, in addition to the mandatory rapid bell ringing, to sound a whistle signal of one short blast, one prolonged blast, and one short blast (·−·) as a warning to an approaching vessel. This is optional and supplements — it does not replace — the bell signal.
Authority: 72 COLREGS Rule 35(g)
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