Stormworld.

Follows two boys, Jason and Lee, after they are transported to an alien world with three suns, through a vortex while on a boat trip that started in Vancouver, Canada. The boys receive help from Flees a seasoned veteran of living on Stormworld who has a special boat named Stormrider. The boys, as new arrivals or "access crashers" as the local inhabitants call them, find shelter at The Settlement.