Okla. Stat. tit. 60, § 1008

A. The use of the "Oklahoma Coordinate System of 1927 North Zone", or the term "Oklahoma Coordinate System of 1927 South Zone" or "Oklahoma Coordinate System of 1983 North Zone" or "Oklahoma Coordinate System of 1983 South Zone" or "Oklahoma Plane Coordinate System" (OKPCS) on any map, report of survey, or other document shall be limited to coordinates based on the Oklahoma Coordinate System as defined in this act. B. Any legal description prepared prior to the most recent system of plane coordinates established by the National Geodetic Survey (NGS) or its successor, or any continual use of legal descriptions prepared pursuant to the provisions of this act which have been recorded or filed in official records within the State of Oklahoma, shall not be affected by this section. C. Nonconformity with the Oklahoma Coordinate System established by this act shall not invalidate any deed, map, plat, survey, description or other document which is otherwise proper.