Donald had just invented the Navicator, a radio direction-finding
device ironically now found in any weekend sailor's arsenal, and believed it would make him his fortune.
On reaching the drifting boat, which had been located with radio direction-finding
equipment, the vessel towed it towards Hartlepool.
Spotting a radio direction-finding
complex, they called in the grid coordinates to an AWACS (Airborne Warning and Control System) plane loitering overhead which in turn summoned waiting F-16s.
The plane and the ship would then use their radio direction-finding
equipment to locate one another and determine the specific course needed to reach Howland safely.
Prophet will replace several existing 20-year-old legacy systems, including Trailblazer, Teammate, Trafficjam, and the Lightweight Man-Transportable Radio Direction-Finding
Lose the quiet" in favor of "tolerance of incessant noise while packed into a small plane." and you have the radio direction-finding mission in Vietnam
Furthermore, the concept of using radio direction-finding specialists on aircraft and simply tying them into the existing DF net hadn't worked either.
The Japanese communications and intelligence officer understood that the British were plotting the fleet's movements using radio direction-finding