MIL-PRF-89202B
a. The intersections of parallels and meridians shall
be within 0.1 mm of computed positions.
b. The overall distance between the first full grid
lines adjacent to opposite neatlines shall not vary by more than
0.3 mm from their computed measurements. The distance between
adjacent grid lines will not vary by more than 0.1 mm from the
computed grid interval.
3.10 Reference systems.
3.10.1 Military grids. The Military Grid System is shown in
accordance the National Geospatial-Intelligence Agency Technical
Manual 8358.1 "Datums, Ellipsoids, Grids, and Grid Reference
Systems". A maximum of three grids are portrayed on Littoral
Planning Charts.
3.10.2 Major grid. The major (or primary) grid is normally one
or two universal grids, either the Universal Transverse Mercator
(UTM), or the Universal Polar Stereographic (UPS). The primary
grid is shown in purple (SPC 96532). Normally only one major
grid is shown on the chart, unless the area covered by the chart
overlaps the junction between the two universal grids as set
forth in NGA TM 8358.1.
3.10.3 Additional grids. Up to two additional grids may be
portrayed. They are shown in order of precedence first in blue
(SPC-48253), and then if needed, in red-brown (SPC-61121). No
more than three grids are shown on a Littoral Planning Chart.
Additional grids are portrayed in the following order of
precedence:
a. Overlapping Grid. If any area covered by the chart
is within 40 kilometers of a grid zone junction, or ellipsoid
junction, or as set forth in NGA TM 8358.1, the overlapping grid
is also shown.
b. Local Grid. In accordance with agreements between
NGA and other producers, or other necessity as set forth in NGA
TM 8358.1, a local grid (such as a pre-WGS grid) may be shown
(see 3.3.1). Examples of these local grids include French
Lambert North African Grids, Madagascar Grid, and Ceylon Belt.
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