Geographical position and calculation using latitude/longitude. Most of this comes from http://www.movable-type.co.uk/scripts/latlong.html
History
Added duplicate include protection, change macro PI to _PI to avoid conflict
2011-09-27, by shimniok [Tue, 27 Sep 2011 04:00:39 +0000] rev 1
Added duplicate include protection, change macro PI to _PI to avoid conflict
Initial release
2011-04-27, by shimniok [Wed, 27 Apr 2011 17:58:09 +0000] rev 0
Initial release