From: "Clarence Bell"

One of the most common discourtesies that I see in the Chesapeake Bay is
sail boaters under power with sails up in a dead calm wind demanding the
right of way because they can only make 6 kts after they turn in front of
the "stand-on" vessel.

A sail boat with sail up but under power is considered a power boat until the
engine is shut down and they are under sail only. It is a commonly used ploy
here on the Great Lakes. Needless to say when passing a sail boat I try not to
rock the boat.