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Example : 45N and 46N? Do ICAO allow STATE PCS?
I would love to know which country this might be as 45 N / 46 N is a very big window. With it I am sure we can provide a much better answer
ICAO talks about EPSG 4326 (WGS84) for data collection and suggest the use of a conformal projection for display. Of course the Projected Coordinate System should be the appropirate one for your area of interest. Each country has it's own implementation and we just need to make sure it is appropriate for aviation use.