INLAND ONLY You have made your vessel up to a tow and are moving from a pier out into the main channel. Your engines are turning ahead. What whistle signal should you sound?

Correct Answer: Option A — One prolonged blast

Under Inland Navigation Rules, for the condition where 'You have made your vessel up to a tow and are moving from a pier out into the main channel. Your engines are turning ahead. What whistle signal should you sound', the correct requirement is: 'One prolonged blast'. This standard ensures clear navigational intent and collision avoidance.