Miss. Code § 89-6-3
The plane coordinate values for a point on the earth's surface, used to express the geographic position or location of such point in the appropriate zone of the systems described in Section 89-6-1, shall consist of two (2) distances expressed in U.S. Survey Feet and decimals of a foot when using the Mississippi Coordinate System of 1927 and expressed in meters and decimals of a meter or U.S. Survey Feet and decimals of a foot when using the Mississippi Coordinate System of 1983. One (1) of these distances, to be known as the "Y" or "N-coordinate," shall give the position in a north and south direction; the other, to be known as the "X" or "E-coordinate," shall give the position in an east and west direction. These coordinates shall be made to depend upon and conform to the plane rectangular coordinate values for the monumented points of the National Geodetic Reference System as published by the National Ocean Service/National Geodetic Survey (formerly the United States Coast and Geodetic Survey), or its successors, and whose plane coordinates have been computed on the system defined in this chapter.
Miss. Code § 89-6-3