Some embodiments provide a program that receives, from a first sensor, a first set of sensor data that the first sensor detects from a first set of signal-transmitting devices. The program receives, from a second sensor, a second set of sensor data that the second sensor detects from a second set of signal-transmitting devices. The program processes the first set of sensor data to determine a first set of potential locations and a corresponding first set of location metrics associated with the first set of potential locations. The program processes the second set of sensor data to determine a second set of potential locations and a corresponding second set of location metrics associated with the second set of potential locations. The program identifies a location from the first and second sets of potential locations as a location of the device based on the first and second sets of location metrics.