irregular line. You indicate the activity taking place within the area by the letters and/or numbers within
the irregular line. Figure 1-15 illustrates a free-fire area (FFA).
Figure 1-15. Free-fire area
7. Symbols for Routes, Obstacles, Crossings, Movements, and Fire Planning.
a. Routes (App B, p B-45). A route is a line, undefined in each direction. As soon as a
direction is shown, the route becomes a nonstatic activity. It is the prescribed course to travel from a
specific point of origin to a specific destination. Figure 1-16 shows a route depicting a direction of
attack.
Figure 1-16. Direction of attack
b. Obstacles (App B, p B-48). An obstacle is any natural or man-made obstruction that
canalizes, delays, restricts, or diverts movement of forces. There are four types of obstacles: points,
demolitions, linear, and minefields. Figure 1-17 shows an obstacle of an antitank ditch reinforced with
antitank mines.
1-15
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