All you need to start geocaching is a portable GPS-enabled device.
GPS (or Global Positioning System) devices receive signals broadcast from satellites. They then use these signals to determine their exact location on the Earth. When you load cache data into these devices, they’ll guide you to where you want to go – most are accurate to within a few yards.
GPS devices used for geocaching can range from the smartphone in your pocket all the way up to high-sensitivity handhelds that are bursting with special geocaching features. With basic models, you can enter coordinates by hand or download and input GPX files, then print out accompanying clues and data. Higher-end GPS units allow you to download data directly to the device; many even offer “paperless geocaching” which allows everything you need to find the cache to be displayed right on the screen.