Military Grid Reference System (MGRS/NATO) grid references provides geocoordinate references
covering the entire globe, based on UTM projections.
MGRS references comprise a grid zone designation, a 100km square identification, and an easting
and northing (in metres).
Depending on requirements, some parts of the reference may be omitted (implied), and
eastings/northings may be given to varying resolution.
qv www.fgdc.gov/standards/projects/FGDC-standards-projects/usng/fgdc_std_011_2001_usng.pdf