Main Page | See live article | Alphabetical index Set and drift are terms in navigation which refer to external forces acting upon a ship that make it deviate from its intended course. Set refers to the direction in which the ship deviates; drift is the speed, in knots, at which it deviates. Set and drift can be caused by anything, but normally they are caused by current, wind, and helmsman error. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.