Agree that a GPS is not perfect, but it will help you with the "whoops, we are totally off the pace" syndrome when you go to an event. Not everybody can go two boat testing, so they need something else to help them measure their efforts. I know, becouse we went the solo route on the Tornado. Very slow progress and always uncertain wether we were competitive or not when we got to an event. Having something to measure with would at least have given us an idea. We did compare our plots with Mike Dobbs on the Tornado, and it was very helpful for our own boatspeed/VMG and for strategic analysis. Since the F16 class is spread around the globe, many sailing alone, gpsar and GPS would in my opinion be helpful.