Skimmed through the video and will watch at a later date. Absolutely fascinating. It used to work at a Raytheon company (Cossor in HarlowvUK) on kit that had similar electronics, back in the 70s. It was like being back in the factory :-)
When I was in the Royal Artillery (80-97) we had a system called PADS (Precision Azimuth Determining System) that was used for survey of gun positions. It had some fancy gyroscopes inside. I now know where that originated ;-)