Mich. Comp. Laws § 560.126

Sec. 126. (1) The survey of all subdivisions shall be performed by a surveyor. (2) The relative error of closure of the surveyed land shall be less than the ratio of 1 part in 5,000. (3) Bearings shall be expressed in relation to the true meridian, or a previously established meridian or bearing and a statement by the surveyor on the plat stating the source of information in obtaining the bearings outlined.