Item description:

Hit continue at the main menu, when the game loads craft the three boss trophies. Now jump in the gyrocopter (R2 Ascends/L2 Descends/Left stick to move) and fly in the direction it is currently pointing, you should see a big ship out in the horizon. Once there craft the plane parts, place them in the plane, store the food, water, and gasoline. Now take off in the plane.

Obtainable Trophies:
Hunter of the High Seas (Collect one sea monster trophy )
Call me Ahab (Collect all sea monster trophies)
Gotta craft them all! (Have made one of each craftable item)
Magnets, how do they work? (Finish a play through without ever using a compass)
Out of the frying pan (Completed the game)