Stage 3 - Was passive data tramsmitted to the Nimrod MR1 crews from actual recordings of contacts... the actual analysis was condcuted inside the aircraft while operating in D807.
I only remember Stage3 as a St Mawgan installation, giving OCU studes something to do on the seemingly interminable L1-L9 when the aircraft never left the local area. Did it move to Kinloss with the OCU, or was there some amazing anaprop to get a VHF signal to D807?
And was not ACT the
AIRBORNE (rather than Acoustic) Crew Trainer, as the Navs used to get involved too, though it was never a particularly inspiring training device.