Quote Originally Posted by catymag View Post
[B]Every official China City navigators are shifted (governement choice).
Traditional Chinese Shifting is up to 600 meters in azimuth 260degrees. Almost inusable in gps

You can see an explanation here in post n5
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As i understand the shifting is not static. Is there an algorithm to get the correct values or is whole china virtually tiled and there is a database with different correction values for every tile?