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Atc Usability of the Navigation Reference System

The navigation reference system (NRS) was designed to provide increased routing flexibility to aircraft operators and air traffic controllers. The NRS is a grid of points that employs a shorthand naming convention to specify waypoints independent of ground-based navigation aids. This study assessed usability of the NRS in simulated en route air traffic control (ATC). Scenarios were designed to exercise the NRS by varying factors such as traffic level and weather conditions. Twenty-four controllers representing four ATC facilities participated. Controllers completed six 45-minute simulation runs and completed questionnaires and debriefing sessions after each run. Controllers found the use of the NRS to be generally acceptable and usable even when traffic counts were high. The NRS was reported to provide significant added flexibility in performing important ATC rerouting procedures. Although several usability issues were identified, none were considered significant enough to outweigh the advantages of the NRS.