The invention relate to a collision avoidance apparatus (100, 200, 300, 22),
system (10) and method (500). The apparatus (100, 200, 300, 22) includes a UHF (
Ultra High Frequency)
transceiver (102) operable to send and receive UHF signals in
electric field (E-field) mode, a VLF (
Very Low frequency)
transceiver (104) operable to send and receive VLF signals in
magnetic field (H-field) mode, and a SHF (
Super High Frequency)
transceiver (106) operable to send and receive SHF signals in
electric field (E-field) mode. The apparatus (100, 200, 300, 22) further includes a control module (110) operable to direct the operation of the respective transceivers (102, 104, 106), thereby to detect
receipt of a
signal via at least one of the transceivers (102, 104, 106), and determine whether or not an alert is to be issued, based on the nature of the received
signal. The apparatus (102, 104, 106) also includes an output arrangement (112) operable to issue an alert in response to instruction from the control module (110) to do so.