THIS HAS BEEN AROUND SINCE ABOUT 2002. BASICALLY SINCE EVERYBODY HAS A PHONE, THE PHONES CREATE A 3D MAP BASED ON THEIR POSITION IN RELATION TO EACH OTHER.
PROTIP: YOUR PHONE'S COMPASS IS NOT A 2D INSTRUMENT.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.