title: Find which direction headed using geo-points
body: <p>Is it possible to make a compass-like using two geo-points?<br>
  So regardless of how my phone is positioned, I want to find which direction I moved (like NW) in real-world coordinate system. In other words, my phone is facing to the west in the real-world, but I am heading to the North-West and I want to find that I am heading to the North-West using two geo-points, or possible others but not a magnetic field.<br>
  Thanks!</p>