Yet the crew (apparently), switched of a fully functioning TANS while approaching a cloud covered headland at high speed.
Does anyone on my planet think that is a logical explanation of events?
Dalek,
They also apparently switched from waypoint A to waypoint B just before switching off the system.
My personal experience, as a grunt, of ops in NI just prior to this period is that crews navigated 'eyes out' with the systems as a check.
In particular I remember a 1989 flight in a gazelle where the pilot set the nav system, which I presume was some relation of TANS, prior to takeoff. We then flew BBK, NTH, XMG, FKH and back to BBK landing at precisely the same spot, after about 20/30 minutes, and the nav system was 200m out.
EG