Geocaching is a high-tech treasure hunting game played throughout the world by adventure seekers equipped with GPS devices. The basic idea is to locate hidden containers, called geocaches, outdoors and then share your experiences online. Geocaching is enjoyed by people from all age groups, with a strong sense of community and support for the environment.

You start off by making an account. Then you can find your nearest caches by postcode or
co-ordinates. You choose a cache and download its information onto your GPS device. You then go out and find the cache (which come in all shapes and sizes, from an ammo can to a rusty screw!). Inside the cache will be a logbook and sometimes small items which you can swap for. You write in the logbook (with your geocaching name) and then hide it again. When you get home, you log that you've found it online.

What that really means is that you use a GPS receiver to find plastic boxes hidden all over the world. Yeah, I know it sounds a little boring, but it's actually great fun!

The only things you need to get started are an account on geocaching.com and a GPS reciever that supports it. Your regular Satnav probably won't, unless they're running Windows Mobile, which you can download a piece of software called Smache (or a few different ones) for. Otherwise, you'll need to use a handheld (walking) GPS