Abstract: A signalling beacon which includes a global positioning system receiver, operable to determine a geographic location of the signalling beacon, a radio frequency transmitter operable to transmit a radio frequency signal, a radio frequency receiver operable to receive a radio frequency signal, a processor, operable to read the geographic location from the global positioning system receiver, to compile a data message containing the geographic location of the signalling beacon and to transmit the data message as a radio frequency signal via the radio frequency transmitter and a waterproof case for housing the global positioning system receiver, the radio frequency transmitter, the radio frequency receiver and the processor.