Gents when I reset my trip log in the garage for the next day The timer starts running again from zero when the boat is not moving. On my Lowrance it would only count time when I exceed say 3mph.( it was adjustable) I found this timer handy to see at the end of the day how long you we were running around and not fishing. Right now I have the trail set to 1 second / 8 feet if that matters. Bill