VHF omnidirectional range
The Australian Hornets were very similar to the standard US Navy variants, but incorporated a number of minor modifications. These included the addition of an instrument landing system/VHF omnidirectional range (ILS/VOR) system, a high-frequency radio, a different ejection seat harness and the deletion of all equipment used only to launch the aircraft from catapults. In addition, two of the Australian aircraft were fitted with flight-test instrumentation so that they could be used as part of trials.