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People Say:

No it s the headset issued to every AFV that is the issue
So it's GD provided headsets? If it's THAT simple a solution, why hasn't anyone said?
Very good article; thank you
Not sure why this enclosure is so thick but even a plastic sprayed with conducting metalic layer would be good enough I think.
Optically based navigation is increasingly feasible on small drones - and much cheaper than INS