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My reverse geocache, or geobox, for short. | by Rumtopf
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My reverse geocache, or geobox, for short.

This box contains a microcontroller that keeps the box locked from the inside until its GPS sensor detects that the box is located at coordinates I can specify beforehand. Basically, I program the box for a certain location and lock a treat inside. I give the box to someone and they get to figure out what the box does and how to multilaterate the position the box "wants" to reach.

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Taken on October 18, 2011