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So, like a compass? "Quantum" probably means they're using a (pretty new) solid state optical sensing mechanism. Remember, everything is "quantum" inside a silicon wafer.
Meanwhile, MEMS magnetometers have been standard in commercial AHRS equipment for quite a while, and it's pretty standard to integrate the data into a navigational solution with other sensors.
Yeah old school navigation was map, compass, speed indication and a stopwatch.
GPS is really nice but not a guarantee in a war so you take that same process but with all the modern instruments (laser ring gyros are worth a google), onboard digital map data and it can be pretty self sufficient