I have a coin that I activated and carry with me when I search for caches to track miles. When I log a cache find I "drop" the coin in the cache then go to my personal page, go to my Travel Bugs and retrieve it. This isn't than accurate as it tracks as the crow flies from cache to cache. It's interesting how many miles you travel. Mine has 3,000 with 125 caches. Makes you think of how much gas you spend searching.