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Published online by Cambridge University Press: 18 January 2010
The Transit system of navigation is based upon the observation, by radio, of artificial satellites. The basis of the method is to determine the line-of-sight velocity of the satellite towards, or away from, the observer at various times as the satellite moves across the sky. With a knowledge of the corresponding orbital positions and velocities of the satellite, the observations can be used to determine, without ambiguity, the position of the observer.