Nothing on how it actually works on the site. GPS? Affected by metal? Work in horizontal orientation?
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A combination of magnetometers, accelerometers, and gyroscopes work together to filter interference and ensure a reliable and accurate true north heading at all times. The unit refreshes multiple times per second for fast, smooth transitions with no lag time when the firefighter turns his head quickly.
currently being tested by the United States Navy SEALS in Coronado, California, in addition to some other Department of Defense units