Group 31 would be the ticket. For the most part everything posted is correct on how to conserve energy. The problem one would run into is if youre in a draw tourney, then that rear unit had better stay on depending on where and what type of water. Otherwise you might as well fish UMF style with the red line and everything. Fish blind and with no input. Team tourney both should be up front if the electronics are going to play a major role.96 Eyra/12 Mercury 175 Pro XS with 2015 single axle trailer2017 Victory Gunner