BOTH INTERNATIONAL & INLAND The maximum length of a power-driven vessel which may show an all- round white light and sidelights instead of a masthead light, sidelights and a stern light is __________.

Under Inland Navigation Rules, for the condition where 'The maximum length of a power-driven vessel which may show an all- round white light and sidelights instead of a masthead light, sidelights and a stern light is', the correct requirement is: '11.9 meters'. This standard ensures clear navigational intent and collision avoidance.