First things first .... your boat is sinking.... FIND the leak and fix it before you launch it.... small leaks can become REALLY BIG leaks fast..... boats can go from seeping a little to on the bottom in very short time...
Next I would consider putting a small (say 300-500 gph) pump on a float switch as low as possible and as big as you can afford on a float switch 6" higher with an alarm siren wired in parallel with the pump..... the small pump should take care of any small amount that finds it's way in but if it fails or gets over run the big pump will both pump water and sound an alarm that something is wrong.
If you tell the marina people and your dockmates that the alarm means "she's sinking, call me right now!" there may be time to save the boat.
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