How Ironic. My very first job out of college, in 1995, was working for an avionics firm that was developing a system called "Tundra Tracker" - that would allow vehicles to navigate in whiteout conditions in the far north. I had the amazingly easy portion of taking the DGPS coordinates of maps/previous tracker runs and turning them into navigation maps. Challenges with the (dynamic) appearance of people, other vehicles, animals (Moose will ruin your day) crevasses, and other elements on the path were left to others to solve. :-)