MIL-PRF-89201B
On insets and plans the grid line interval should be selected so that
at least two grid lines are shown horizontally and two vertically, even though
the interval does not conform to FIGURE 1.
3.10.4 Border ticks and interior ticks. Portrayal of border ticks
only, or border ticks and interior ticks is based on the following criteria:
a. All nautical charts on the Transverse Mercator Projection, requiring
a UTM or other grid will contain border grid ticks. Full or continuous grid
lines will be shown when a specific requirement is validated.
b. On Mercator and other projections where the grid will not be
parallel lines, the grid will be shown by border ticks and where necessary, by
interior grid intersections (+).
3.10.5 Overlapping grids. UTM grids normally consists of grid zones
extending 3 west and 3 east of a central meridian, which is labeled with a
easting of 500,000 meters. The grids from the adjacent grid zones are extended
beyond the grid zone junction so that dual grids will be shown on charts
containing a junction. The extent of the grids will be subject to the
conditions in Section 3.10.6. However, extending the grid to the west more
than 500,000 meters should be avoided to preclude showing negative grid
values.
3.10.6 Extent of overlapping grid coverage. At scales of 1:75,000 and
larger, both grids will be shown across the entire chart. The overlapping
grid is omitted if there are no land bodies within the 40 km overlap area. At
scales smaller than 1:75,000, both grids will extend one set of border ticks
beyond the zone junction.
3.10.7 Grid color. Primary grid ticks are printed in purple, and
overlapping grid ticks are printed in blue.
3.10.8
Grid labeling (exterior).
a. Border ticks will be labeled centered between the neatlines and
border, with the labels centered on the ticks (or as near as possible).
b. Grid values shown on the side of the chart will be oriented parallel
to the neatline with the tops of the characters toward the West. Grid values
for eastings will be oriented with the tops toward the North.
c. Unless a special requirement exists for showing full grid values on
all ticks, only the ticks nearest each corner will be labeled with full grid
m
m
value indicating N or E as appropriate. Any tick designating a 100,000
meter square, that is not a corner tick, will show the full compliment of
zeros but no letter designations.
d.
Charts will show two principal figures representing 10,000 and 1,000
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meters, preceded by one or two smaller figures. Example:
87
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