I'm sure someone will, but to be honest it'll be a bit of a hobby. I have a sun compass and have used various methods to find position in addition, but GPS is now so reliable and honestly cheap you'd be better off carrying a spare GPS for any practical purpose. Now a compass and map, that's a different story, the map is a lot easier format than most GPS units and the compass takes up zero space. If you knew where you were a few hours ago and roughly which direction you were going, you'd need to be a long way from anywhere for a simple compass bearing not to bring you to safety.
An interesting subject though, astronomy to a practical purpose.
Andy
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