Section 54.237 - Use of coordinates on map, report of survey, or other document(1) The use of the term Michigan coordinate system of 1927 on a map, report of survey, or other document shall be limited to coordinates based on the Michigan coordinate system of 1927 as defined in section 5.(2) The use of the term Michigan coordinate system of 1983 on a map, report of survey, or other document shall be limited to coordinates based on the Michigan coordinate system of 1983 as defined in section 5a.1964, Act 9, Eff. 8/28/1964 ;--Am. 1988, Act 154, Imd. Eff. 6/14/1988 .