I use 2 hummingbirds one in front mounted on trolling motor and one at helm (transducer mounted inside bottom of boat in the rear). shoots thru hull and works as well as front by the way. I locate fish and or structure with either and then take a look with the aqua view. Since I started using this tactic I seem to be catching more fish. They also assist in navigation. I do not run expensive units seem to get buy fine with the cheaper 140.00 electronics.