You’ve heard of geocaching, right? Go to a location specified by GPS coordinates and find a hidden cache?

Mikal Hart created a box with a GPS inside that only opens when the box is at a set of GPS coordinates.

…a puzzle box that won’t open until it is taken to a certain location.

Quoted from http://arduiniana.org/projects/the-reverse-geo-cache-puzzle/

It’s such a cool idea, I really want to be the kind of person that makes something like this. I especially love the end of his writeup:

This little box is a novel way of combining a GPS, a servo, a button and a display. How many more marvelous combinations lurk out there, if only someone has the imagination to put them together the right way?

Quoted from http://arduiniana.org/projects/the-reverse-geo-cache-puzzle/