I have one of the sidescan units. I like it very well, but there are some quirks to sidescanning. For it to read the bottom correctly, you have to do the following: be moving in a fairly straight line and be traveling at 2-5 mph (it definitely will not work on plane). I have my transducer mounted on the jackplate because they are about $250 to replace. Given all of this, if mounted on the trolling motor, you would still need to be moving at the stated speed and refrain from turning your trolling motor.