An out-of-route collection capability is provided for an AMR data collection system of a type that collect readings within a geographic area using a radio. If a transmission is received from an out-of-route transmitter, its location is based on a geographic location of the data collector as the data collector receives data from the out-of-route transmitter. The location can further be determined by evaluating a received signal strength indicator (RSSI) for the transmission. The out-of-route transmitter is identified by association with a transmitter identification number. The out-of-route transmitters can be added to the route through operations at the central office.