Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for location tracking are disclosed. In one aspect, a method includes the actions of receiving, from a computing device that is configured to receive radio signals from beacons, beacon data that includes data identifying a corresponding beacon and data identifying a power level of a corresponding radio signal. The actions further include receiving, from the computing device, sensor data collected by a sensor that is located on the computing device. The actions further include based on the beacon data, determining a location of the corresponding beacon. The actions further include based on the sensor data, adjusting the location of the corresponding beacon. The actions further include generating a user interface that identifies the corresponding beacon and the adjusted location. The actions further include providing, for output, the user interface.