When I was a wee lad, I had a little battery powered toy boat. It was kinda stupid because it had no steering system. It would just crash into everything.
I had something like that. If yours was like mine then you were supposed to set the rudder on the bottom so it just did circles. By set, I mean just kind of bend it.
Ari and I sometimes take our kayak to various creeks, rivers and estuaries in our area. Always makes for enjoyable exercise in a beautiful environment.