In stopping distances of vessels, "head reach" can best be described as the __________.

Correct Answer: Option D — distance the vessel will run between taking action to stop her and being stationary in the water

Head reach is the distance a vessel travels forward from the moment an order is given to stop or reverse engines until the vessel is dead in the water. This is a critical maneuvering characteristic for emergency stopping and collision avoidance, as defined in standard ship handling and seamanship principles.