i have the newest update for the 73 dv. i had an issue with mine last week and Garmin sent it to me. returned it to bass pro for a lowrance before it arrived. I think the 73dv has a better sonar than the lowrance. good unit. I'll pay it forward and give someone the update SD card Garmin mailed me if any one wants it. pm me if you want it. still new in the garmin packaging.