BOTH INTERNATIONAL & INLAND When a vessel signals her distress by means of a gun or other explosive signal, the firing should be at intervals of approximately __________.

Correct Answer: Option A — 1 minute

Under Inland Navigation Rules, for the condition where 'When a vessel signals her distress by means of a gun or other explosive signal, the firing should be at intervals of approximately', the correct requirement is: '1 minute'. This standard ensures clear navigational intent and collision avoidance.