And just a quick question, what sort of motor are you running in the boat, that esc is rated 4amp continuous current, most motors of reasonable size draw way more. A standard 550/540 sized motor will draw 11amps on start up load and drop to 6amps continouse running. ( recommend mtronics 15amp esc)
400 sizes are around 6amp start up load and drop between 2 and 4 amp during the run. (Recommend mtronics 10amp esc)
320 and 280 sized motors will fit that esc but only just!
I cannot stress enough about stall current, if you don't have enough amps on the esc then the motor will burn up the esc in a blaze of hell fire once the props under load of the water, especially with large pitch sized props and if the prop gets tangled in weed or similar that draws more load on the motor and poof
I'm not joking I've messed up esc's in my younger days before and fire is a REAL issue!
Let us know because if you get the esc wrong you will end up with a pool of black smoke poor out of the model when that prop comes under load!!!!
I'm Not Anti-Social, I'm Anti-Stupid.