Aviation System Standards

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• Geodetic Calculations
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COMPSYS 21 Geodetic Calculations

COMPSYS 21 is a free download designed to perform geodetic calculations. This user-friendly graphics interface developed for the National Aeronautical Charting Office includes nine standard geodetic calculations. The calculations include Forward, Inverse, Segment/Segment, Bearing/Bearing, Segment Distance, Circle Bearing, Circle/Circle, Segment Bearing, and Airport Reference Point. All geodetic computations within COMPSYS 21 are based upon the National Geodetic Survey's (NGS) forward and inverse routines. The National Oceanic and Atmospheric Administration's (NOAA) National Geodetic Survey manages a national reference system and provides federal standards for geodetic survey.

COMPSYS 21 users can easily determine fix locations, bearing and distances. For instance, the segment/segment calculation will return the intersection of two line segments. If the segments do not intersect, COMPSYS 21 will extend the lines to find an intersection. The results of any computation can be sent to a user-defined printer, saved/appended to a file or used for any additional calculations. Users of COMPSYS 21 include many FAA offices including ATA, AVN, all Air Route Traffic Control Centers (ARTCCs), TRACONS, some airport control towers, NGA, and avionic companies.

1. Download Compsys21.zip and copy the file to your PC.
2. After you have successfully downloaded and unzipped this file, run setup.exe.

User Documentation. . . . . .Compsys21.pdf

The COMPSYS software is Government developed, and thus public property. It is free of any license restrictions. The U.S. Government is not responsible for misuse of the software by third parties.

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Viewers or converters for Microsoft Word, PowerPoint, or Excel documents can be downloaded from the Microsoft Office Assistance Center. [more...]