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NAD 27 Conus is a very old (1927) datum. There are a lot of errors in it. NAD 83 is much better but you have to work with what you have.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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