This was deemed important because in the Gulf War the relatively featureless landscape caused problems in the Tercom terrain-following guidance.
BBC: cruise launch as seen through HMS Trafalgar's periscope
Its terrain-following radar can be linked to the aircraft's autopilot - so the plane itself can follow the contours of the landscape at a height of just 100 ft (30 m).
BBC: News | In Depth | Military Fact Files
The aircraft has terrain-following radar and GPS satellite navigation.
BBC: Profile: B-1 bomber
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