GPS technology is cheap enough that we are starting to see GPS being used in some cool new ways. You may remember this GPS game that we featured before. Markus has made a project he calls the Little Reverse GeoCache, it is based on a similar project that was made by Mikal Hart. The box can only be opened when it is in the correct location, the trick is that the location is not known to the user who is given the box. You are given a finite number of button presses to try to determine the magic location, when the button is pressed you are told how far away from the location you are.
“Other than with ordinary GeoCaches you do not need to find the box at the target coordinate: You will already have it when the puzzle starts. But the box is closed and it will only open when you are near the target coordinate. In order to find the coordinate, the box has a button: When you press the button, the internal GPS receiver will detect the current location and the distance to the target will be displayed. Of course the number of trials is limited. If you press the button too often, the box will be sealed forever.”
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