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GPS Procedures (Overlay Approach)

Asked by: 2716 views Airspace, FAA Regulations

Excerpts from AIM in italic :

·        “Only approaches contained in the current onboard navigation database are authorized”.

 Is it possible to have published (approach plate) overlay approaches that are not in a GPS database?


·        “On overlay approaches, if no pronounceable five−character name is published for an approach waypoint or fix, it was given a database identifier consisting of letters and numbers. These points will appear in the list of waypoints in the approach procedure database, but may not appear on the approach chart.”


Why would the GPS database have the waypoints but the published approach plate not have the waypoint?


My thought is that it would make sense to have the waypoint also on the published approach plate to crosscheck the GPS database because how else can someone


4 Answers

  1. Wes Beard on May 20, 2013

    There are RNAV GPS approaches that are on paper that the GPS or FMS box isn’t authorized to conduct. In those cases, you cannot shoot that approach.

    There are also waypoints that ATC does not care about but the GPS does to make the approach work. The missed approach point when it is at the beginning of the runway is required for the box buy not by ATC. The beginning waypoint on a DME arc is required in the box but is not typically named by ATC. The approach plate will give a radial and DME distance.

    Even though the waypoint is not named, the pilot can double check the box for accuracy pretty easily.

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  2. Dan Chitty on May 20, 2013

    Thank you Wes.

    Any reason why the FAA would have a GPS paper approach chart but the GPS database not have the approach in the GPS database?

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  3. Wes Beard on May 20, 2013

    If the GPS isn’t authorized for the approach. See RNAV (GPS) SAAAR approaches and approaches with radius to fix.

    Also, some approaches have a waypoint inside the FAF and some older GPSs aren’t programmed to accept that design.

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  4. Dan Chitty on May 20, 2013

    Thank you for the feedback.

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