Ohio Revised Code Title I. State Government § 157.04

Plane co-ordinates, used to reference and describe land boundary corners and made a part of the recorded description of such corners, shall be considered adequate evidence of the location of such corners in the absence of original physical monuments or other acceptable controlling evidence of original corner locations. In all instances where reference has been made to such co-ordinates in land surveys, the scale, sea level, and grid factors must also be stated for the survey lines used in computing ground distances and areas.

Nothing in this chapter shall be construed to require a purchaser or mortgagee of real property to rely wholly on a land description, any part of which depends exclusively upon either Ohio co-ordinate system.