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2 Answers

RNAV Approach

Asked by: 1963 views Airspace, FAA Regulations

See KCRQ RNAV(RNP) Z RWY 24:

There is a note that says "GPS required" in the briefing section at the top of the chart.

What segment of this approach requires GPS ?

For the segment that requires GPS, why cannot a non-GPS RNAV navigator support the segment?

Thank you for the feedback.

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2 Answers



  1. Wes Beard on Feb 23, 2014

    Notice that this is a RNP approach and the aircraft is required to stay within 0.10NM 95% of the time.

    No RNAV system that does not rely on GPS has a RNP lower than 0.30NM. Notice, the second minima line shows 0.30NM so the FAA does not want a RNAV unit using DME-DME for its position report.

    From my understanding and John C. probably has better information, GPS is required for the whole procedure to +/- 1NM and 0.10NM or 0.30NM for the final approach segment which also requires GPS.

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  2. Dan Chitty on Feb 24, 2014

    Thank you Wes.

    I used KCRQ as an example but as I look further at other airports with RNP as well as GLS approaches, I see the GPS Required note in the briefing section for all RNAV RNP and GLS approaches. Lets see what John says as you mention above.

    Thank you again for the feedback.

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