Standard GPS can get down to 2m. With RTK you can get down to 1 cm. Phones use WiFi scanning, cell tower scanning, Bluetooth scanning, accelerometers, gyroscopes, and magnetometers in addition to GPS for state estimation. Our mates at Google probably throw all that real time data into a Kalman filter that spits out your location down to the fucking atom.

Standard GPS can get down to 2m. With RTK you can get down to 1 cm. Phones use WiFi scanning, cell tower scanning, Bluetooth scanning, accelerometers, gyroscopes, and magnetometers in addition to GPS for state estimation. Our mates at Google probably throw all that real time data into a Kalman filter that spits out your location down the the fucking atom.