Abaft the beam

See under Beam. (Naut.) in an arc of the horizon between a line that crosses the ship at right angles, or in the direction of her beams, and that point of the compass toward which her stern is directed.

What is Abaft the beam?

Just behind where the width at the widest width of a boat is located. In this diagram, “abaft the beam” is circled for the port and starboard side.“Abeam” is also commonly used to refer to as simply a direction 90 degrees from straight ahead of straight astern. “Abaft abeam” could therefore be defined as an angle over 90 degrees from dead ahead.

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