The process of using
a radio scanner with a automatic transmitter frequency identification feature (near field reciever) and following the action live without having to know the frequencies
in advance. Related to WarDriving WarWalking and WarChalking as it is associated with finding
open internet access points. Optoelectronics calls the feature a "Sweeper". Uniden calls it "Close Call" and Radio Shack
calls it "Signal Stalker".