It was foolhardy for the Skipper and Gilligan to set out on a raft before determining an accurate location of the island. They clearly didn't know considering the huge difference between the coordinates given in "Big Man on a Little Stick" versus those given in "X Marks the Spot." It would be impossible to know which direction you need to take and you would certainly get lost at sea.
Community content is available under CC-BY-SA
unless otherwise noted.