30th Mar 2017
Question: When Kelly shows Chuck the map on the dining room table she shows him where he was rescued by the ship and where "his island" was located. How was it determined exactly where the island was?
Chosen answer: The island's location could be determined by compiling pieces of information, including the dates and locations of where the plane crashed into the ocean, when and where the cargo ship found Chuck, and how long he was adrift to and from the island. Chuck, an experienced sailor, was obsessed with tracking time. He knew when he left the island because he had created an analemma, a type of calendar that charts star movement throughout the year, seen on the cave wall. Wind factors, weather conditions, and ocean currents would also be on record for those times and locations, and, depending on how long Chuck drifted on open water, his course could later be calculated by computer modeling and the island's (or its approximate) coordinates determined.
Also, I am sure that he was either shown, by FedEx or the freighter, a map of where the ship found him on the raft. After living on the island for so long; mapping it and trying to find any way to escape, he probably would be able to easily identify the island, especially after being shown a map with tide charts.
7 mistakes in Beetlejuice you never spotted
10 biggest mistakes of 2017
A new menu and more - thoughts welcome...
25 biggest mistakes in classic Disney movies
First pictures of Josh Brolin as Cable for Deadpool 2