GPS (Global Positioning System) is a space-based satellite navigation system that provides location and time information in all weather, anywhere on or near the Earth, where there is an unobstructed line of sight to four or more GPS satellites.
I think it's a really good invention because it really helps you to find places and guide you.
Then there's something like a game which is planned on the internet. Someone hides a "treasure", that person gives you coordinates and you have to find it. There's also a similar thing but with books.
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