Hi Otto,
If you are going to be fishing for carp from your boat using bait you will have to anchor the boat down. If you are going to target carp with artificials then that is a different story.
You can catch them using the sliding rietvlei trace with SWD, floaties and mielie bomb, pretty much the same way you would from the bank, only thing is you don't have to worry about your casting distance.