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GPS Overlay Chart

Asked by: 2980 views Airspace, FAA Regulations

  1.  If the header of the approach plate has only “GPS” listed, does this mean that GPS can only be used ?  Is this considered a GPS overlay approach? See sample in 2012 Instrument Procedures Handbook pg. 4-60 as this has only “GPS” listed on the header and is listed an overlay approach (figure 4-37)---excerpt below for reference. I ask because, I was always under the impression that overlay approaches are listed as for example “VOR or GPS RWY12”

 

 

2.       If the header of the approach plate has “RNAV (GPS) listed, does this mean that not only GPS navigation can be used but also other RNAV navigators such as VOR/DME or FMS?

 

3.  If the header of the approach plate has “VOR or GPS” listed, is this considered an overlay approach?

Thank you for the feedback.

 

The original GPS approach procedures provided authorization to fly nonprecision approaches based on conventional, ground-based NAVAIDs. Many of these approaches have been converted to stand-alone approaches, and the few that remain are identified by the name of the procedure and “or GPS.” These GPS nonprecision approaches are predicated upon the design criteria of the ground-based NAVAID used

as the basis of the approach. As such, they do not adhere to the RNAV design criteria for stand-alone GPS approaches, and are not considered part of the RNAV (GPS) approach classification for determining design criteria. [Figure 4-37] 

 

 

3 Answers

  1. Best Answer


    John D. Collins on Apr 19, 2013

    1. If the approach title only contains “GPS”, it is a stand alone GPS approach. There are still some of these remaining, but they are being replaced by RNAV (GPS) procedures.
    2. From the TERPS manual for RNAV approach specifications: These criteria do not support very high frequency (VHF) omnidirectional range/distance measuring equipment (VOR/DME) RNAV, inertial navigation system (INS), or inertial reference unit (IRU) RNAV operations, or DME/DME RNAV final or missed approach operations.
    3. Yes.

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  2. Dan Chitty on Apr 19, 2013

    Thank you John for the feedback. Can you please include the link for the TERPS reference in comment # 2?

    Also regarding comment # 2, would there be a notation on a approach chart “RNAV (GPS)” that would state that the following are not authorized? very high frequency (VHF) omnidirectional range/distance measuring equipment (VOR/DME) RNAV, inertial navigation system (INS), or inertial reference unit (IRU) RNAV operations, or DME/DME

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  3. Dan Chitty on Apr 19, 2013

    Thank you for the feedback.

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