Re: First attempt at boat repair
There should be a center cap on the steering wheel somewhere. Under that cap should be a large nut holding the steering wheel on to the steering shaft.
There may be a metal key in a key way along the shaft, it fits into a slot in the steering wheel..... Or at least there should be, acts as a tab so when the steering wheel is turned it actually turns the shaft, instead of just free spinning on the shaft.
Once you get the steering wheel off, there is probably a trim ring/collar behind it screwed to the dash, to act as trim covering the steering hub mounting screws. Remove the trim collar.
Take the hub mounting screws out & the hub should come free. And be dropped out from behind.
Once you get the wheel off, and the trim collar, it shouldn't be too difficult, even if my details don't really match your setup...
On your 2 spoke wheel, the center cap may be held on by friction clips, or small screws from the backside of the wheel......