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Aaaaaaaah, sorry!!! Yes, in the car - now I got it!!! Haha, I thought you had seen any belt on the board (in the water) and I just didn't get it...
Well the seat belt wouldn't help much in the unlike event of an accident. However, I feel "safer" like that. Actually it's better to have it well stored on the roof of the car, but I refuse to spend much money on a box...:-)