United States Department of Transportation
i
Pilot GPS LORAN Receiver Programming Performance A Laboratory Evaluation
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1994-02-01
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[PDF-3.74 MB]
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Edition:FInal Report May 1992 - September 1993
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Abstract:This study was designed to explore GPS/LORAN receiver programming performance under
simulated flight conditions. The programming task consisted of entering, editing, and
verifying a four-waypoint flight plan. The task demands were manipulated by varying
flight turbulence and the time interval between test sessions. Flight performance
data indicated that subjects were well trained on the flight task; significant effects
of turbulence and test interval were not found. Programming performance was very good
and critical errors occurred on only 13% of the test trials. Examination of the
conditions surrounding each error indicated that specific display design and system
logic attributes contributed to the errors. In addition, examination of error
recovery methods showed that non-intuitive menu structures complicated and confused
the recovery process. Pilots rarely recalled "doing anything wrong" when errors
occurred, suggesting that the receiver interface design was opaque and did not provide 00
a good understanding of system function. Recommendations for GPS/LORAN receiver
controls, functions, menu structure and logic, error recognition and recovery, and
general usability are discussed.
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