While attempting to calibrate, my PP speedo stopped indicating speed, just 0.0. My analog speedometer is working fine and I assume it is connected to the paddle wheel the PP is connected to. I got the analog speedo set with GPS and then tried adjusting the speed on the PP. While PP control was on and set, I hit menu/calibrate/went down 3MPH and nothing seemed to happen. After several unsuccessful attempts, I turned PP off and back on, now the digital speedo will not show anything but zero. Up until six months ago I've never had PP, now that we're surfing I don't think I can't live without it! Any suggestions would be greatly appreciated.