USCG USCG ROR
Set 4 • Question #311 of 475
Launch Interactive Practice Room INLAND ONLY While underway in a harbor you hear a vessel sound a prolonged blast. This signal indicates that this vessel __________.
A
desires to overtake your vessel
B
is at anchor
C
is backing her engines
D
is moving from a dock
✓ Correct Answer
USCG NMC Regulatory Explanation
Under Inland Navigation Rules, for the condition where 'While underway in a harbor you hear a vessel sound a prolonged blast. This signal indicates that this vessel', the correct requirement is: 'is moving from a dock'. This standard ensures clear navigational intent and collision avoidance.
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