The Tomahawk has two different guidance systems: One is the Terrain Contour Matching (TERCOM) and the other one is the (DSMAC) system. A stored map is used by TERCOM to compare with the actual terrain to determine the missile's current position.
The preparation of a TERCOM map requires high-quality geographic data of specific terrain features that meet stringent requirements for changes in elevation. TERCOM lacks in accuracy. It should be supplemented by other technologies, like DSMAC. ( GPS ) is a better alternative to TERCOM.
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