Rules of the Road · Sound Signals — RV Power Making Way
In restricted visibility, a power-driven vessel making way through the water sounds, at intervals not exceeding 2 minutes:
- AOne short blast
- BOne prolonged followed by two short blasts
- CTwo prolonged blasts
- DOne prolonged blast✓ Correct
Explanation
A power-driven vessel making way sounds one prolonged blast at intervals of not more than 2 minutes. If underway but stopped and making no way, she sounds two prolonged blasts (about 2 seconds between them).
Authority: COLREGS/Navigation Rules, Rule 35(a)
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