2.4GHz for boats is kind of a pain because the frequency waves can reflect off the water causing all sorts of issues. If your transmitter will bind to a Spektrum marine receiver with along antenna, then you shouldn’t have much trouble. The main caveat I see with using an aircraft transmitter for anything surface or marine is due to the throttle stick not being spring loaded to return to neutral/idle. If the stick gets bumped when you don’t want it to, you could find yourself in a rough predicament. It’s not uncommon to use stick radios for boats or cars, but it takes a little extra care and finesse. I have a JR XP9303 myself, but I won’t use the 2.4 due to the receivers having short antennas. I have a handful of FM receivers that have super long antennas, which is really important for boats. FM doesn’t have a failsafe option though, IIRC.