Configure an External Navigation File

The Use External Navigation File dialog allows you to specify an external text file containing the navigation (or 'NAV') file. You must specify which columns in the NAV file represent the trace number, group x coordinate, and group y column. The trace-number in the NAV file will be mapped to the Shot Point number in the trace headers.

A NAV file typically contains fewer entries than the number of traces in the SEG-Y file. Coordinates are specified for some Shot Points and the remaining trace locations are interpolated.

If the file contains navigation for multiple SEG-Y lines, specify the Line Column in the file and select the appropriate Line Name from the drop-down list.

Configuring an External Navigation File

  1. Under Navigation, select Use External Navigation File.

  2. Browse to the location of your NAV file.

  3. Select the file and click Open. The Select dialog closes.

  4. Check File is delimited if required, and specify the column and line information.

  5. Specify the Coordinate System of the coordinates within the NAV file.

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