This is not about the compass per se, it's about adding an extra sense. The article that made me interested in these kind of things was in Wired about 10 years

This is not about the compass per se, it's about adding an extra sense. The article that made me interested in these kind of things was in Wired about 10 years ago: http://www.wired.com/2007/04/esp/ http://www.wired.com/2007/04/esp/ . Well worth the read in my opinion.