Ohio Rev. Code § 157.07
Co-ordinates based on either Ohio co-ordinate system and used to describe and locate positions of land boundary corners shall be surveyed and determined within a maximum positional error of plus or minus 0.05 metres, except that it may be less than 0.05 metres if local land survey standards of practice for positional errors so dictate, with respect to the nearest horizontal control station established in conformity with the standards of accuracy and specifications for first and second-order geodetic surveying as prepared and published by the federal geodetic control committee of the United States department of commerce. The standards and specifications issued by the federal geodetic control committee in force on the date of such survey shall apply. The publication by the United States department of commerce of existing control stations or the acceptance by the department of newly established control stations with intent to publish them shall constitute evidence of adherence to federal geodetic control committee specifications. These limitations may be modified by a duly authorized state agency to comply with local conditions.
R.C. §157.07