Personally, I don’t own a GPS receiver – but I now quite a few people who do. I can see why – it’s a fun toy, but a toy after all – at least for people who don’t use it professionally. You can change that now by using it for treasure hunt! Check out the Geocach page for details. In a nutshell, a container is hidden somewhere, and all you have are the coordinates. Once you find it, make an entry in the log book, take an item, and add a new item. Have fun!