Horizontal. WAC ▇▇▇-▇▇▇-▇▇▇ states, “The datum for the horizontal control network in Washington shall be NAD83 (1991) [the North American Datum of 1983] as officially adjusted and published by the National Geodetic Survey of the United States Department of Commerce and as established in accordance with Chapter 58.20
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Sources: Interagency Agreement, Surveying and Mapping Procedures