Robin Monroe: If you were half a pilot, we wouldn't be on this island!
Quinn Harris: I'm the best damn pilot you're ever going to meet!
Robin Monroe: Ha! I've flown with you twice and you've crashed half the time!
Robin Monroe: Pirates?! As in, 'Argh?!'.
Answer: Once they were in the air, Quinn would be able to navigate by sight. He was an experienced pilot and and was familiar with the territory and the different islands' configurations. He would also be looking for ship traffic, and he had a general idea which of several islands they were on. Once in the air, he would easily know which direction he was heading based on the position of the sun.
raywest ★
But he passed out. And the ocean is a big expanse, not a lot of landmarks to navigate by.