The Montana coordinate system NAD 27 north, central, and south zone may not be used after July 1, 1993; the Montana coordinate system NAD 83 is the sole system to be used after this date.
Mont. Code Ann. § 70-22-210
Limit on use of Montana coordinate system NAD 27
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.