Question 4153 Deck General

The correct answer is D) When a vessel is dead in the water any speed displayed by Doppler log reflects the current. This is correct because when a vessel is dead in the water, it is not moving under its own power and any speed displayed by the Doppler log will reflect the speed of the current, not the vessel's speed. The Doppler log measures the speed of the water flowing past the vessel, so if the vessel is not moving, the Doppler log will only show the speed of the current. The other options are incorrect because A) refers to a dead in the water condition that is not related to stopping distance, B) a tunnel bow thruster cannot be used to reduce stopping distance, and C) a lightly laden vessel would actually have a shorter stopping distance than a fully laden vessel when the current is from astern.