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 to measurements made during flight by an on-board radar altimeter. A TERCOM system considerably increases the accuracy of a missile compared to inertial navigation systems (INS). The incr...
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http://en.wikipedia.org/wiki/TERCOM
(from the article `cruise missile`) ...(550 miles per hour) and weighed from 1,200 to 1,800 kg (2,700 to 3,900 pounds) each. The missiles were guided by an inertial navigation system ... ...processing—presented inexpensive, lightweight, and highly reliable methods of solving the persistent problems of guidance and control. Perhaps ...
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http://www.britannica.com/eb/a-z/t/26
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