The Fifth Amendment, as currently interpreted, doesn't provide the protection you describe. It protects against giving self-incriminating testimony and essentially the question is whether the password is "testimony." Keep in mind that the government is not asking him to disclose it, just to type it into the computer. Here's a good discussion: http://volokh.com/posts/chain_1197670606.shtml (There seems to be a CSS problem with that page, but the text is fine.)
You have the coordinates of the dead body, or they can dig and scan each square foot of the continent. This is not a Fifth Amendment case. They don't want or care about the coordinates itself. They can't use the information you provide (the coordinates of the dead body) to incriminate you, no matter what the coordinates of the dead body is.