Related Clues:

• Back, at sea
• Sailor's back
• Propeller's locale
• Behind the ship
• To the back of the boat
• P.M.
• At the back of the plane
• Plane heading?
• Not forward
• Sailor's direction
• Back on a boat
• Back on the briny
• At right angles to the keel
• Rear part
• Near the tail