I called the boat dealer today. Im going to take the boat in tommorrow and let them sort it out. He said its possible the GPS is the problem. Said something about the GPS needing a switch on it or else it would draw constantly from the battery. I dont get that...but thats what he said. I took the boat out after work...and like clockwork, 3 hours into the trip the low voltage warning came up again on the 997. The voltage alarm IS set to off so the problem isnt in the unit adjustments. So I come home...plug the on-board charger in..and in 20 minutes it indicates that battery is fully charged! I am done with it. Im going to let them sort it out tommorrow.