I purchased one. Very nice. We were tracking a pig the other night and got lost in the woods on adjoining property. Luckily we called someone at camp and they drove to our last spot and started honking their horn. we were not 20 yds from the fence but were totally turned around. This is the second time I have been lost at night. Well no more. This compass with GPSlets you mark up to 3 locations and you just follow an arrow back to the selected location, tells you how many yards or miles you are from the spot. Me and my son played a game, I would take an item and go hide it in the woods, mark the location and give my son the back track, he would follow the arrow and found the item ever time.
You could mark the spot where an animal was hit then up to 2 more times on blood trails. Just follow your arrow back. Or mark your base camp then up to 2 more spots I got mine on ebay with a 55.00 buy it now price.
Link

http://www.bushnell.com/gps/gps_backtrack.cfm