Stabilisers ?

Well, only a bit. You have these flappy out things on the side of the boat, a bit like rudders, except up and down. There conected to a gyroscope. I had one as a kid, mine worked off string power, I expect they have improved on this. However, no matter what you do to a gyroscope, it always remains upright, even ballance on a piece of string. So I guess, with computer wizzerdry, if gyroscope says,lean left a bit, flappy things go right, or is that left. Well whatever, it goes opposit way to wave, so you stay upright'ish.
 
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