United States Department of Transportation
i
Design Considerations for IAP Charts Approach Course Track and Communication Frequencies
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1991-08-01
[PDF-4.01 MB]
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Edition:Final Report March 1990 - January 1991
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Abstract:This report describes two experiments evaluating format changes on instrument approach
plates (IAPs). The study used a simple chart reading task to assess information
transfer in IAPs.
The first experiment addressed different methods of displaying approach course informa
tion. Three methods were evaluated: font size, bold type, and reverse video. Bold type
had a negligible effect on chart reading performance. Both boxing and reverse video
improved the speed with which items could be found and or identified on the chart. The
use of font size as a method for presenting information was clear; a larger font size, 12
point, was more effective for presenting the inbound heading, than a smaller, 9 point
size.
The second experiment examined the effectiveness of four different layouts for displaying
radio frequencies. Three of the four layouts were similar to those found in existing
charts published by NOAA, Jeppesen Sanderson, Inc. and the Canadian Department of Energy,
Mines and Resources. The fourth layout was a two column layout, not currently found on
existing charts. The two layouts analogous to the formats used by NOAA and Jeppesen
Sanderson, Inc. resulted in similar performance. Performance in the two column layout
and boxed layout was superior to performance in the NOAA and Jeppesen Sanderson, Inc.
formats.
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