I heard about it several years ago through wheresgeorge.com where people would drop bills in a cache and have them travel to other caches (like TBs & GCs). I was intrigued, but didn't have the time to spend to justify buying the GPS device. Fast forward a few years later, the kids are older and I have more time and I as able to select a gift out of catalog as a reward for 15 years of service at the company I work for. There it was, a wonderful Garmin GPS device. Two months into it and loving it. I'll be interested to see if I'll want to do this when the the temperature drops below freezing