terrestrial guidance

World English Dictionary
terrestrial guidance
 
n
Compare inertial guidance a method of missile or rocket guidance in which the flight path is controlled by reference to the strength and direction of the earth's gravitational or magnetic field

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WordNet
terrestrial guidance

noun
a method of controlling the flight of a missile by devices that respond to the strength and direction of the earth's gravitational field 
WordNet® 3.0, © 2006 by Princeton University.
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