There are quite a few ways ....
one of them is to travel head first
you lie on your back and move your hands in a figure of 8 shape going towards your thighs and then back up to your hips.
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Generally in a single scull (where there is just one person) the Sculler (the person sculling) will pull harder on one blade thus turning the boat in the opposite direction.
This is achieved by pushing harder with one leg.
In bigger boats, they often have a rudder and a stearing mechinism to turn the boat operated by someone in the boat called the coxswain (who does not row) or often in smaller boats such as fours and pairs by a mechinism on the scullers footplate that turns the rudder.
The coxswain usually has controls to a rudder. Also, to spin the boat, the rower in the bow rows on one side, while the strokeman in the stern rows on the opposite side.
I don't know what a Charles it, but if you are wondering how to steer a single sculling boat, you either have to move the foot peddle. Or you have to paddle harder on one side.