Once again the difference between the GT54 and GT56 is power like the livescope. How much do you think you will be using the side imaging, down scan and sonar with livescope. Usually I’m only using those if I’m moving, all my fishing is done with livescope. I don’t use that transducer enough now to justify the cost for the difference. I would put my money to things that would help livescope or display resolution. Larger is better but I don’t know the resolution and specs between those units.