On Thu, 16 Aug 2007 10:11:47 -0700,
wrote:

http://www.monkeybutler.com/boat/temp/Movie_1.wmv

These movies were taken while we were bucking an outgoing tide at the
entrance to the Cape Cod Canal. We were idling which usually gives us
around 3 knots. My GPS was indicating 1 to 2 knots SOG but in this
case I believe it was actually reporting our backwards progress.
Notice that the waves are overtaking us.

Help me out here.

You were heading into an outgoing tide at the Canal?

Because that doesn't make any sense.