'The Heath' - is LakenHeath AFB, England - right outside of London, I think
INS - Inertial Navigation System - usedta be at least three tri-axial spinning gyros. That type of system is subject to 'shocks'/sudden moves messing them up. Would have to be reset/renormalized with a known point of reference or other navigational info to get 'em back on track. That's my 'recall' on 'em anywhooz.
Remember- this was back in '82 - pooters have come a long ways since then. GPS systems - started deploying in '78*NAVSTAR* - but not fully operational until '93.
grew up with that kind of lingo - so can understand others getting a little discombobulated by it. *S*
I got a hoot out of his call sign ... Furtenberger. Now, that's funny !
From: http://www.airvectors.net/avf111.html
The primary navigation system was an AN/AJQ-20A inertial navigation system (INS), complemented by a TACAN radio navigation beacon receiver.
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The TFR could be coupled to the autopilot for hands-off, high-speed, low-altitude flight in at night or in bad weather. I actually had to do some of this, and it scared me silly. On autopilot, the aircraft would follow terrain contours at 200 feet and, with the wings swept back, at airspeeds above 500 knots. This was bad enough in weather, which will usually give you a peek at the ground. But black, dark night or, worse, night weather would keep you on the edge of your seat -- which is where you better be, given the then-current state of avionics. Once or twice while auto-TFR-ing at night, I -- no kidding -- saw reflections bounce off dirt on either side, the terrain lit up by the strobing of the aircraft's rotating beacon.
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