Temporary receivers for HIFT designed by APL/UW were shipped to several remote parts of the globe. These were essentially Sonobuoys, ruggedised and equipped with a larger battery to extend their life to a week or more. One of these was deployed by the Royal Australian Navy in the Indian Ocean near Christmas Island. The RAN routinely patrols the region between Indonesia and the Australian North Coast to detect and intercept illegal fishing and curtail people smuggling activities. For the duration of HIFT, the RAN accommodated a CSIRO scientist on board a Fremantle class patrol boat board, who operated the receiver and data logger according to the planned transmission schedule. The figure shows a HIFT receiver in the foreground (orange floatation collar) and a white recovery float to ease retrieval.