I would like to be able to turn on/off each transducer individually.....not all of them or none of them. Had to put a switch in for my ps21 that is on my trolling motor and out of water while searching for fish or structure with the ps30 and gt52 on the transom. Ordered a gt22 for under the tm...its going to just stay on out of the water unless i can find a way to turn it off individually.