For those with nothing better to do, you could always read this
document from the FAA technical guys:
https://www.gps.gov/technical/ps/2008-WAAS-performance-standard.pdf -
it's a little out of date, but I 'm sure there is one more current out
there.
Happy reading!
Mark WN952MW (res)

        -----------------------------------------From: "Jeff Scott via KRnet"

To: krnet@list.krnet.org
Cc: "Jeff Scott"
Sent: Monday January 13 2020 10:20:43AM
Subject: Re: KR> ADS-B Out

 You are into a gray area there. There is WAAS, and then there is high
integrity WAAS, which is what the FAA is requiring for ADS-B out. The
ADS-B Out system will report the GPS integrity level, and you can read
it in your PAPR report.

 -Jeff Scott

 >
 > But maybe I didn't answer Joe's question....I assume any GPS will
work
 > with it....it's just a + and - battery connection and a single data
 > line...three wires total. It needs to be WAAS for accuracy, and I'm
not
 > clear on whether or not certification with an ADS-b is reliant on a
 > specific GPS, but I'm guessing anything WAAS-capable would suffice.
I'm
 > sure somebody will correct me if I'm wrong....
 >
 > Mark Langford, Huntsville, AL
 > ML "at" N56ML.com
 > www.N56ML.com

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