I would have to agree with post above. I tried to use a Futaba 9CAP with a boat and it was very difficult to use. Obviously, there are those that can use them, I'm just not one of them. I would go with a pistol grip "wheel" radio for a boat. I personally prefer Futaba but, if you want to stick with Spectrum, you might consider this:
https://www.spektrumrc.com/product/d...r/SPM2340.html