OUPV & 100-Ton Master · Sound Signals
In restricted visibility, a power-driven vessel making way through the water sounds, at intervals of not more than 2 minutes:
- ATwo prolonged blasts
- BOne prolonged blast✓ Correct
- CThree short blasts
- DOne short blast
Explanation
Under Rule 35, a power-driven vessel making way in or near an area of restricted visibility sounds one prolonged blast at intervals of not more than two minutes. A power-driven vessel underway but stopped and making no way sounds two prolonged blasts.
Authority: Navigation Rules, Rule 35
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