Readback: December 2019

In the August 2019 Readback, your reply to the writer who was referring to the More ILS vs. LPV article (February 2019) errs when you say that GPS is a single receiver system for various satellites and WAAS ground station(s). WAAS data is transmitted to users from geostationary communications satellites. Currently three geo comsats are broadcasting WAAS signals covering North America.Jim TorleyColorado Springs, CO

Key Takeaways:

• WAAS signals are transmitted to GPS receivers from geostationary satellites, which broadcast corrections processed by ground stations.
• Non-certificated pilots must adhere to the MDA (Minimum Descent Altitude) as a hard deck on non-vertically guided approaches, even if their equipment provides a pseudo-glideslope.
• Humorous "On the Air" stories in the publication are often embellished for comedic effect and should not be taken as examples of safe or legal aviation practices to emulate.
• Canada's Phase 3 ADS-B requirements are currently uncertain; pilots can equip cheaply for the U.S. and await further clarity, or invest in a diversity transponder for immediate compliance in both countries.

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