I'm a kite buggier, is kitesurfing much different?

Yes. Your kite skills will give you a big advantage in keeping the kite out of the water and controlling the kite power, but riding a board is a whole new thing. It requires a lot more practice than buggying.

Don't expect to be able to go upwind on your first try as you did in buggying. Give it at least 10 hours of practice time to be able to ride upwind, and more than that to be able to stay upwind. More if you have never done any kind of board sports before (snowboarding, wakeboarding, etc).

You also need a lot more wind to kitesurf than to buggy (about twice as much wind). More.

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