At one stage the C130K had a wall mounted "Hand Held" GPS known as the PLGR which was for ground army use. In the manual it specifically said "Not to be used in aircraft". This kit was the cross check for the Litton INS. Fortunately the Herc never got you anywhere too quickly to lose you badly. Quantum compasses weren't even a dream then. As for Schrodinger's cat it wasn't there.
