USCG USCG ROR
Set 4 • Question #310 of 475
Launch Interactive Practice Room INLAND ONLY What is the whistle signal used to indicate a power-driven vessel leaving a dock?
A
One short blast
B
Three short blasts
C
One prolonged blast
✓ Correct Answer
D
Three prolonged blasts
USCG NMC Regulatory Explanation
Under Inland Rule 34(g), a power-driven vessel leaving a dock or berth must sound one prolonged blast (4 to 6 seconds) on her whistle as a warning signal to other vessels navigating nearby.
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