![A screenshot of a GPS navigation app on a mobile device. The screenshot shows a map of the IU Bloomington campus.](https://blogs.iu.edu/sciu/files/2018/01/gps_screenshot_original-1j03ikc.png)
How exactly does your “Maps” app know exactly where you are, any time of day? The “little blue dot” on your phone tells you where you are as the result of billions of dollars invested in the Global Positioning System (GPS), a network of 27 satellites currently orbiting the Earth. Each satellite sends microwaves constantly,… Read more »