over and stop the boat! Then figure out where you were. It even happened to me a few years ago and I caused all the problems myself. It was in the middle of the night, no moon and rough seas and we were heading up the inside of a long reef system. I went to change the RADAR range and the boat bounced and slewed to port just as I was going to push the button. My aim was off and I pushed the on/off button to the chart plotter but only halfway. Not hard enough to turn the unit off but hard enough to change the screen from night to day configuration and blank the screen out. I didn't realize what I had done and it appeared that the unit had turned itself off. I turned the unit back on but seeing as how the unit was already on I actually turned it off. With the unit off, the auto pilot went nuts and I got an off course alarm and of course lost the RADAR as well. The compass was bouncing all over the place because of how rough the seas were so that didn't help. I had a reef on one side, the rocky shore on the other with no compass, chart plotter or Radar. I really had to "re-group" and "focus" because it was so unexpected and exactly the wrong time. We stopped the boat and went to work getting the back up GPS on line which told us were we were in relation to the reef and shore and then started trying to reboot the chart plotter. It took me a few minutes to figure out what had happened but at least I was doing it while I knew where we were. That kind of stuff really gets you head in the game pretty quickly. On top of that it doesn't do much for your marriage. Ours survived but I was in the dog house for quite some time.