(1) As established for use in the north zone, the Montana coordinate system NAD 27 shall be named and in any land description in which it is used it shall be designated the "Montana coordinate system NAD 27, north zone".
(2) As established for use in the central zone, the Montana coordinate system NAD 27 shall be named and in any land description in which it is used it shall be designated the "Montana coordinate system NAD 27, central zone".
(3) As established for use in the south zone, the Montana coordinate system NAD 27 shall be named and in any land description in which it is used it shall be designated the "Montana coordinate system NAD 27, south zone".