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Aviation History
1965
1965 - 0031.PDF
Precision or improvisation? • Decca/Harco is the only system that provides all the facilities for the automatic, accurate navigation of sub- and supersonic aircraft. With the Data Link this in-flight information is continuously relayed to the ATC centre. In the air Decca Omnitrac—the world's most advanced light-weight airborne digital computer—provides undis- torted charting with automatic chart changing and the ghost beacon facility which gives bearing and distance to any point. Its function also includes auto-pilot coupling and automatic altitude control which maintain respectively any desired flight path and the required flight profile. An ETA meter indicates either time-to-go to destination or ETA. On the ground the Data Link permits the accurate display of the identity, altitude and position of all co-operating aircraft. It is economical in the use of the radio frequency spectrum, is not ambiguous and has a service range to the limit of the communications band being used. Its twoway facility reduces use of speech and eases the work-load by eliminating routine reports and messages. With the Data Link the Air Traffic Controller can interrogate aircraft in the order he requires, and he can be sure also that he and the pilot are using the same navigational data. cuts out the guesswork The Decca Navigator Company Limited • London
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