The only way to "spoof" an INS system would involve changing the Earth's gravity field.
No, spoofing an INS (and there were 3 on a 747 twenty years ago) isn't possible - but operator error is. FAA regs required each INS (Honeywell LN-20 POS) to be programmed by different operators but this probably rarely got done. Either a number was transposed (on all 3 INS only likely if the same tired crewmember did each), or if the aircraft was moved during the programming.
Back in the 1950s aircraft used radio compasses which could be spoofed (the term is 'MIJI') by setting up a stronger signal on a radio beacon's frequency. An EC-130 was tricked across the Soviet Armenian border on September 2nd, 1958, and promptly shot down.
The RC-135 that was in the vicinity at the time KAL 007 first strayed into Soviet airspace was leaving the area. The operators on board probably were listening to FM and getting paperwork ready for post-mission debriefing, so it's unlikely anyone there heard anything. Misawa AB, on the otherhand, probably got a whole bunch of GCI that they didn't know what to do with until too late.
No matter, the Soviets shot it down - the pilot admitted in a TASS interview that he knew it was civilian.
KAL 007 was shot down to avoid an embarassment, since a Russian can suffer anything except ridicule. The only survivers were the conspiracy theories.
I don't know if it's possible the Russians could "spoof" a commercial 747's INS but I'd guess the nature of the equipment precludes such a possibility ... any takers on this concept out there?Check out "Mel's Hole" as featured on the Art Bell show ... 'remote viewing' might also have a tie in </sarcasm> ...
You would have to affect gravity, time and space in order to affect ANY changes on an IN unit. Unless you're prepared to explain how this is done you're just throwing terms around and idlely conjecturing about the landscape.
Maybe goodelle has some ideas - he/she/it 'claims' to have an engineering background, registered, and educated to the depth a "Masters" level at a recognized school ... so far I'd say he/she/it would have difficuly plotting the course out-of the proverbial brown-paper shopping bag ...
An registered 'engineer' with no concept of 'system' operation - what can he/she/it possibly be qualified in?
Concrete hardness calculations?
On second thought - he/she/it only seems to be versed in handling the political undercurrents of possible international treachery and coverups - forget about hard, cold factual material from this duck ...