GPS tracker in 6d and other upcoming cameras

[Marsu42]

Imho this would get Magic Lantern a very large popularity boost because people wouldn't have to buy a dedicated tracker next to a 6d, so using ml would actually save money:

The 6d (and other upcoming cameras that most likely also will feature gps) can only display the current position and write a log. The functionality missing to use the 6d as a gps tracker substitute is:

1. Quickly set the current position or a list of positions as a reference ("car finder mode")
2. Allow the user to enter a list of custom coordinates either on the camera or with a pc on the ml card ("geocaching mode").
3. Calculate distance (and probably direction, see 4.) to another set of coordinates
4. Show the compass direction the camera is moving to by comparing two gps samples

Imho at least the very basic "car finder mode" should be rather simple to implement, if the calculation of distance and direction should prove to be to complicated in the first step even a simple coordinate difference would suffice ("your target is xyz coordinates away"). The next step would be the "geocaching mode" list of coordinates, even if this would be achieved 2/3 of the functionality of a €100 gps tracker would be done by ml.