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its not like that jos, when they fly over polar region or (grid region - generally know as) they dont follow magnetic heading values, they will take the inertial values that are calculated from the gyroscope and use those heading values for navigating, this value referes to the true north value...

what does CTV represent in the navigation systems?

what does the pilot understand with the grid heading and what does he do observing the grid heading values.

how is the heading calculated considering the magnetic and true fields in the polar region, will there be any change in the heading values due to the longitude location..          -- explain in detail plz