Drift

To move under the influence of wind, waves or water flow rather than a deliberately maintained track.

A vessel can drift when stopped, disabled or intentionally allowed to move with the water, while a floating object drifts according to its windage and immersion. An anchored vessel that moves because the anchor is not holding is more specifically dragging its anchor.

In navigation, “drift” can also mean the speed component of a current or the sideways effect contributing to track error; conventions differ between current triangles, aviation-style set and drift, and everyday speech. Those numerical meanings should be stated explicitly rather than assumed from the general verb.