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ATD

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ALONG-TRACK DISTANCE (ATD)

The horizontal distance between the aircraft’s current position and a fix measured by an area navigation system that is not subject to slant range errors.

Listed in the Pilot/Controller Glossary as a cross-reference to ALONG-TRACK DISTANCE (ATD), whose text is shown above.

Source FAA Pilot/Controller Glossary · checked 2026-08-25

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