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using the North American Vertical Datum of 1988 (NAVD 88).

NAD 83, along with NAVD 88, is scheduled to be replaced in 2026 with the Datum of 2022, a new geometric reference frame and geopotential datum based on GPS and gravimetric geoid model.

First North American Datum of 1901

In 1901 the United States Coast and Geodetic Survey

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