Assignment

Help me out if you can.

Before 2000, the US "scrambled" GPS signals available for civilian use to make sure that the US military could have much more accurate GPS data than...anybody but the US military. An executive order had them turn off that function and gave us all the same sort of accuracy.

I remember reading about one of the unintended consequences of the move. A museum had a giant boulder, and they also had a screen showing the GPS location of the boulder. While the physical rock was clearly still in one place, the map showed it moving magically around the building. But unscrambled GPS ruined the joke. Or something like that, but I don't remember the details. Can anyone find the work I kinda remember from 13 years ago?

Thanks.

Until then, here's some GPS art that uses very accurate data.