INLAND ONLY Passing signals shall be sounded on inland waters by __________.

Correct Answer: Option B — a power-driven vessel when crossing less than half a mile ahead of another power-driven vessel

Under Inland Navigation Rules, for the condition where 'Passing signals shall be sounded on inland waters by', the correct requirement is: 'a power-driven vessel when crossing less than half a mile ahead of another power- driven vessel'. This standard ensures clear navigational intent and collision avoidance.