Full Astern moves the vessel in which way?

• A. Stop
• B. Move backward at full speed
• C. Move forward at full speed
• D. Move backward at half speed

Answer: (B)

Full astern means the propulsion is set to reverse at maximum power. The propellers push water toward the bow, and the reaction on the hull pushes the vessel to move backward along its length. In other words, the ship backs up, moving toward the stern, not stopping or moving forward. If you’re already moving forward, applying full astern will first reduce that forward speed and then drive you backward at full speed. Half astern would give a slower reverse, while ahead would push you forward at full speed. This setting is used to back away from a dock or arrest forward motion quickly.