USS Tantalus (ARL-27) USS Tantalus (ARL-27) USS "Tantalus" (ARL-27) was one of 39 "Achelous"-class landing craft repair ships built for the United States Navy during World War II. Named for Tantalus (a legendary king of Lydia condemned to stand in a pool of water up to his chin and beneath fruit-laden boughs only to have the water or fruit recede at each attempt to drink or eat), she was the only U.S. Naval vessel to bear the name. Originally laid down as "LST-1117" on 10 October 1944 at Seneca, Illinois by the Chicago Bridge and Iron Company; launched on 2 January 1945; sponsored
Set and drift Set and drift The term “set and drift” is used to describe external forces that affect a boat and keep it from following an intended course. To understand and calculate set and drift, one needs to first understand currents. Ocean currents are the horizontal movements of water from one location to another. The movement of water is impacted by: meteorological effects, wind, temperature differences and gravity and on occasion earthquakes. Set is referred to as the current’s direction, expressed in true degrees, and the drift is referred to as the current’s speed, which is usually measured in knots. Ignoring set