You are going to need some terminal connectors and a wire stripper/crimper, available at any hardware store. I use terminal crimps, some use alligator clips. Avoid the cheapest stripper. They don't crimp for crap. Spend a few extra bucks for a decent one. For your settings, it will be worth your time to watch a couple videos. There's thousands of variables in the settings, and you will get a good head start, and can then keep tweaking for you and your waters.
There are a couple good comparison videos out there, like
I have a gt52 on my kayak and gt56 on my boat and I see a huge difference. Difference between gt54 and gt56 is not nearly as great, based on the videos I've seen.... but there certainly is better definition from the gt56.
I've got 4 or 5 different brands. The only thing that differentiates is that the BPS ones blow. The others are pretty much interchangeable. If you're on the edge of two different sizes, I suggest go with the shorter one. Too short is not a problem. Too long is a problem.
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