$\Delta Lat$
1′ = 60″
1″ = 31m.
Northing
Length of 1′ meridian
$\Delta Dep$
1′ = 60″
1″ = 30m.
Easting
Length of 1′ parallel
Unless no dimensions given for length of 1′ meridian and 1′ parallel, use 1″ = 31m. for $\Delta Lat$ and 1″ = 30m. for $\Delta Dep$$\blacksquare \quad \text{start with the southwest corner element of the area}$
$\blacksquare \quad \text{always in the form of degrees-minutes only}$
$\quad \bullet \quad \text{Sectional Numbering}$
$\quad \quad \blacktriangleright \quad \text{clockwise in numbering/labeling}$
