BOTH INTERNATIONAL & INLAND In narrow channels, vessels of less than what length shall not impede the safe passage of vessels which can navigate only inside that channel?

Correct Answer: Option A — 20 meters

Under Inland Navigation Rules, for the condition where 'In narrow channels, vessels of less than what length shall not impede the safe passage of vessels which can navigate only inside that channel', the correct requirement is: '20 meters'. This standard ensures clear navigational intent and collision avoidance.