Plot hole: After running from the pirates, the two castaways almost stumble off a cliff. Unless they were running backwards, I'm sure they would have seen the cliff coming for a while, because when the camera zooms out you can see clear terrain for at least 20 metres until the edge of the cliff.
Plot hole: The morning after Frank and Angelica sleep together the hotel manager comes to her cabin to get her for the search. He says the helicopter leaves in 20 minutes. She wakes up Frank and tells him they have to go. The next time we see them they are eating breakfast. They only have 20 minutes but that is enough time for him to go to his cabin, shower, do his hair and change, while she does the same thing. Then there is still time to go to the restaurant, order food and get it. That is some long 20 minutes.
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.