On a side note: be prepared that Wherigo cartridges may not always work as hoped. I've had cartridges crash on me while in the middle of playing them. The reasons for that may not be obvious, and sometimes it's not even possible to recover from the crash (meaning you have to start over completely or abandon the whole thing). I've been able to save the day sometime by doing a Wherigo with a fellow cacher that has a different GPS device altogether (like one running on IOS, the other on Android or a dedicated GPS), so that if one cardridge crashes, we're able to continue on the still running Wherigo of the other cacher on a different device. Just some advice from the field . . .