Frank your Majesty said:

I know that I'm harsh on it, but I just couldn't relate to the main characters acting foolishly. I guess I'm just not the type for supernatural mystery stuff, so I tried to rationalize what was happening and that took away the suspense.

Well, if I remember right, it was just one of the guys who was unhinged and hysterical and threw the map away in a fit of rage when he was alone, which led to the other two getting really pissed off at him. Also, as others have said, he was going a little crazy and was lost and terrified so I guess it's understandable.