Described herein is a system and method for detecting the position of a remote emitter (1) where the emitter (1) is emitting a radio frequency signal (2) in a radio field (3). The system and method uses at least one receiver (4) which is moveable within the environment of the radio field (3), each receiver (4) measuring and recording the amplitude of the radio frequency signal (2) and recording its precise location using a GNSS or GPS receiver. The data recorded is processed and compared to data predicted by the receiver (s) (4) to estimate a location of remote emitter (1).