As you can tell by my previous post on 7-31-2015, "Lowrance!!!!. I have some reservations about my Elite 7 HDI. The 2D and GPS seem to be working O.K.. My question : Would I be better off to use the HST-WSBL already mounted on the back or the Hdi skimmmer that came with the unit. Di seems to be a lost cause and SUCKS. I will just use the GPS and 2D and forget the DI. ......thanks for any suggestions....crappie1133