> While I understand how FlightRadar works, with just my GPS coordinates how does the app correctly identify the plane that I'm pointing to? Your device has a

> While I understand how FlightRadar works, with just my GPS coordinates how does the app correctly identify the plane that I'm pointing to? Your device has a magnetic compass. The reason for rotating the device is to calibrate the compass, which relies on a Hall Effect sensor which isn't always accurate until it's been rotated in Earth's magnetic field. At the end of the process, the device has a geographic position and a reliable compass bearing. It uses this information to draw a vector, and with any luck there's only one plane within the confines of the vector.