Tested the GPS on the weekend at 1 of the last races for the season.
Was a real blast with flattish water, wind 20 to 25kts, and a long course (13nm), in a multi leg/ lap track on the Tamar river. We logged 17nm in just over 3 hours, at a GPS average of 5.3kts and as high tide was roughly half way throu the course, its effect where cancelled. On the running legs with the spinnaker we only occasionaly got on the plane, but still managed to log a maximum of 9.7 (not quite a 10!) that was very exciting I can assure you.
Have found the Garmin to be very nice to use, and been able to upload tracks to my PC via serial cable etc. Only trouble at the moment is with datums between maps and GPS (within about 200m at this stage).