“Honeywell's inertial reference systems navigate only in true but display magnetic headings to pilots,” Jerry Norton reminded readers. “However, at 72.5 deg. N, they are programmed to switch to true course.” A retired avmanager at Honeywell, Norton logged considerable time piloting a Gulfstream in avionics trials in the high latitudes. Above 80 deg. N, “just like going across the Pacific,” he observed, “there are not a lot of alternates, just Barrow, Deadhorse, and Spitsbergen ...

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