Fix Intersection (fix.dat) File Format Specification

This information is historic and only relevant to X-Plane 10 and earlier

This specification defines all fixes (also known as intersections) X-Plane 10. The effect of this data is to:

  • Allow these fixes to be selected in X-Plane’s GPS and FMC systems.
  • Display the fixes on X-Plane’s charts.

BASIC CONCEPTS

  • Latitudes and longitudes are described in a decimal notation (eg. 20.12345678).
    • A latitude of 50 degrees 30 minutes south would be defined as -50.50000000
  • North latitudes and east longitudes are positive. South latitudes and west longitudes are negative.
  • Unlike other data files, no ‘row codes’ are used for fix data, since the file contains just one type of data.

FILE CHARACTERISTICS

The earth_fix.dat files are plain text files:

  • Fields in the data can be separated by one or more white space (space, tab) characters.
  • By default, the files are generated so that columns of data are consistently aligned, but this is not required.

FILE STRUCTURE

  • In common with most other X-Plane data file specification, header rows of data define the origin (“I” = PC or “A” = Mac) of a particular copy of a file, and define the file specification version. The file specification may be followed by a reference to a sequential release data cycle and build number for the data, and a copyright message.
  • Subsequent rows of data define each nav-aid. Sequence is not important, but by default this file is sorted by row code, then by nav-aid name.
  • The file is terminated by a ‘99’.

EXAMPLES

Here is example data for a fix:

37.428522 -097.419194 ACESI

DEFINITION OF DATA FIELDS

Meaning of example fix data (fix.dat)
Fix example Example Usage
37.428522 Latitude of NDB in decimal degrees. Eight decimal places supported.
-097.419194 Longitude of NDB in decimal degrees Eight decimal places supported.
ACESI Name of fix. Usually five characters. Unique within an ICAO region.

 

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