TERCOM
MISSILE NAVIGATION SYSTEM
Tercom; Terrain Contour Matching; DSMAC; Digital Scene-Mapping Area Correlator; Topographic guidance; Photographic guidance; TERCOM-Aided Inertial Navigation System; Terrain mapping; Terrain contour matching
Terrain contour matching, or TERCOM, is a navigation system used primarily by cruise missiles. It uses a pre-recorded contour map of the terrain that is compared with measurements made during flight by an on-board radar altimeter.