Aft
From Openwaterpedia
adjective - Aft is at, near, or toward the stern or rear part of a boat.
As opposed to the Starboard (side of a boat that is on the right when one is facing forward), Port (side of the boat that is on the left when one is facing forward), Bow (front part of a boat).
The swimmer was being fed on the aft of the escort boat.