Okla. Stat. tit. 60, § 1007

A. For the Oklahoma Coordinate System of 1927 and the Oklahoma Coordinate System of 1983, the unit used to convert feet to meters shall be the United States survey foot 39.37/12 feet for each meter and defined as the U.S. survey foot. B. For the Oklahoma Plane Coordinate System (OKPCS), the international conversion value (1 International foot equals 0.3048 meters exactly) shall be used and defined as a foot.