USCG USCG ROR
Set 7 • Question #397 of 475
Launch Interactive Practice Room BOTH INTERNATIONAL & INLAND You are underway, in fog, when you hear a whistle signal of one prolonged blast followed by two short blasts. This signal could indicate a vessel __________.
A
not under command
✓ Correct Answer
B
being towed
C
aground
D
All of the above
USCG NMC Regulatory Explanation
Under Inland Navigation Rules, for the condition where 'You are underway, in fog, when you hear a whistle signal of one prolonged blast followed by two short blasts. This signal could indicate a vessel', the correct requirement is: 'not under command'. This standard ensures clear navigational intent and collision avoidance.
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