The Voyage Of The Frog — Gary Paulsen

ONE BOY'S TALE OF SURVIVAL ON AN UNFORGIVING SEA....
Fourteen-year-old David was only trying to fulfill his uncle's last wish when he set sail on the Frog. He wasn't ready for the way the world seems to disappear out on the ocean, and he certainly wasn't expecting the savage storm that nearly took his life. David quickly learns that surviving on the sea is different from anything he knows on land. The waves can be merciless, the storms unpitying, and the creatures that lurk beneath the surface dangerous.

With only a small ration of food and a deadly calm following the brutal storm, David must find his way back to land ... if he can endure the other challenges the water holds.