For those that want an inexpensive GPS, Garmin makes the Geko line. The Geko 101, (the one I have) regularly sells on Ebay for 50-60 dollars. A very basic unit that is as accurate as devices that cost much more. I only tracks 4 satellites, and is not WAAS enabled, but it has never failed me even in heavy cover. It's real accuracy is typically in the 10 to 15 foot range. It has a convenient Trackback feature that will follow a "breadcrumb" trail of waypoints back the way you came.It will store up to 500 waypoints, as well as elevation, and speed readings. It is tiny and easily fits in a shirt pocket. No bells and whistles, just simple lightweight reliable location mapping. It's waterproof too! Garmin makes a Geko 201 and a Geko 301 as well, with a few more features.