From OpenwaterpediaJetSki or on a paddle board or surfboard accompanying or leading an open water swimmer for protection and/or guidance in an open body of water.
The escort was leading the swimmers out towards the last turn buoy.
1570–80; < F < It scorta, deriv. of scorgere to conduct < VL *excorrigere]
The coach will escort the swimmer on a kayak during the race.
paddle and kayak (for).