b. Map Overlays.
Map overlays show the routes of travel, unit
standard military symbols (FM 101-5-1). You can prepare a map overlay as
a one-color or multicolor presentation.
(1) One-color presentation. When preparing the over-lay as a one-
color presentation, use solid single lines to construct the symbols for
the friendly forces and solid double lines to construct the symbols for
Additionally, all symbols representing enemy equipment,
ground positions, and activities have the abbreviation "EN" shown in
(2) Multicolor presentation.
When preparing the overlay as a
multicolor presentation and showing the symbols representing friendly
units, posts, installations, equipment, and ground activities, use blue
or black for symbols identifying friendly forces and red for enemy
Use yellow to show both friendly and enemy chemical or radiological areas
and enemy biological areas and use green to indicate friendly and enemy
man-made obstacles. To help show who made or created any of the areas,
place the abbreviation EN in the enemy forces symbols. If you use any
other color in your presentation, ensure that a legend explains the
(3) Preparing a map overlay.
To prepare the overlay, tape the
required map or map section to the drawing surface and attach a sheet of
tracing paper over the area for which you must prepare the overlay. Then
trace and label two grid registration marks on the tracing paper, one in
the upper left-hand corner and the other in the lower right-hand corner
(figure 2-29). All map overlays must have two grid registration marks,
each showing horizontal and vertical grid identifiers.
When you have the tracing paper correctly orientated and marked, place
the security classification at the top and bottom center of the overlay,
and plot the data from the VI work order or information sheet provided,
using standard military symbols. Using a coordinate scale and protractor
to plot the symbols ensures the symbols are located accurately on the
This concludes lesson 2 of the subcourse.
Before proceeding to the
examination, complete the practice exercise that follows this lesson.
When you have completed the practice exercises and have a thorough
understanding of the lesson, then complete the examination for the