(channels; simultaneous; accurate; terrain) (2-19)
As valuable as maps are for preliminary study of an area, they have certain disadvantages. The chief
disadvantage is the rapid obsolescence of certain map data. The depiction of man-made features on older maps may
be unreliable. And since it takes so long to make a map, some of the information on it could become obsolete before
the map is printed.
One disadvantage of map reconnaissance is that the maps may be ___________________________________.
(foliage; defilade) (2-43)
In combat zones, the low-flying, slower aircraft usually used for visual reconnaissance are vulnerable to enemy
fire. Under such conditions, it may be preferable to depend upon high-altitude photographic surveillance, if
Aircraft or visual reconnaissance missions under combat conditions are vulnerable to enemy