We used a dish on our RV, it was in-motion/auto-tracking dish so that we could use it while on the road. It worked pretty well. Same technology is usable on boats. We got ours through Camping World. Ours was Directv based as we have it at home already. It was a standard sat box from our house that plugged in.
Are you looking for something used just at the dock or when under power?
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