This report documents an evaluation of the usability of TSO-C129a-certified Global Positioning System (GPS) receivers. Bench and flight tests were conducted on six GPS receivers. The evaluations covered 23 flight tasks. Both subjective and objective measures were recorded to assess the usability of the receivers and to identify potential human factors problems. Reports of the results of each individual evaluation were written previously and presented to the FAA and to the GPS manufacturers. This report provides an integrated summary of those six evaluations.
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