Ever wonder what your long-range nav system would look like if your aircraft were crossing the north pole? After “90 deg. N” appeared on the display, what would the FMS do? How would it orient itself coming out “the other side,” given that all directions radiating from the pole are “south”? Would the GPS sensors be able to triangulate a reliable position, given that the balk of the satnav constellation is concentrated in the mid-latitudes? Back in 1990, while engaged in ring-laser gyro ...


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