On Wed, 29 Jul 2009 00:43:29 -0400, "JR" wrote:

The paddle wheel is about a foot starboard of centerline and I do see a
slight diff
but I don't worry about it. I trim for max speed on each tack if that is
what I'm
looking for that day.

That's fine as long as you aren't doing vector calculations with the
speed to compute true wind numbers or VPP/polar predictions.