Okla. Stat. tit. 60, § 1003
For purposes of describing the location of any survey station or land boundary corner in the State of Oklahoma, a plane coordinate may be used to supplement but not to change the position of a land boundary corner or land description as created by the Oklahoma base lines and meridians.
Laws 1990, HB 1293, c. 138, § 3, eff. November 1, 1990.