FWIW, the "latitude and longitude, but also your altitude, heading, and speed" is the standard set of GPS data. Also, some of the relevant Javascript is here:

FWIW, the "latitude and longitude, but also your altitude, heading, and speed" is the standard set of GPS data. Also, some of the relevant Javascript is here: http://static.ak.fbcdn.net/rsrc.php/z3RA8/hash/273u6o5s.js http://static.ak.fbcdn.net/rsrc.php/z3RA8/hash/273u6o5s.js