Agree entirely with HD and anotherthing. The radar might be the tactical representation of reality, but you cannot say that it is more important than the data display - one complements the other. Only by repeated scanning of the data display (and anotherthing correctly describes what is implied by "scanning") can you pay regular attention to each aircraft and therefore initiate appropriate action. Apart from some specific scenarios, if you give priority to the radar, you can develop tunnel vision and completely overlook some required actions.
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