Re: Obviously not GPS jamming
The problem was that the Vulcan's radar emissions could be tracked long before the aircraft itself (which was flying at low level) so the search radar was off. I met one of the navigators that flew on Black Buck missions. They were briefed to switch radar on when passing over the task force fleet to ID themselves, the logic being that the task force were expecting them and the direction of approach would rule out Argentine aircraft. But as the Vulcan approached their warning systems lit up with numerous fire control radars from the fleet and as the navy had a long-established reputation from WW2 to shoot first and ask afterwards, the crew turned their own radar off and hoped they didn't collide with the superstructure of a ship. They had to make landfall at a precise location, hence the need for INS kit as they could only use their own radar NBC system for the actual bomb run.
Later BB mission had Vulcan armed with Shrike (?) missiles to knock out Argentine defence radars and lurked around off the Falklands wanting to be painted by them as Shrike homed in on their emissions.
Biting the hand that feeds IT
