Abaft

Abaft is a nautical expression indicating a point that is behind a given part of a ship. If not qualified it means behind the mid-point of a ship or group of ships. For example, "abaft the funnel" means behind the ship's funnel.

Note that unqualified or in the "abaft the beam" form it does not necessarily refer to a point actually on the ship, it may refer to a point some significant distance away.