Stepdowns On the GPS?
Early on I learned that sinking below a critical altitude is one of the most difficult errors for me to correct. This has often left me wondering why altitude guidance from GPS navigators is so minimal. With WAAS it knows my altitude often better than my altimeter, and it can warn me when I’m too close to the ground. Why can’t it tell me when I’m about to bust a step-down altitude on an approach, or what altitude is next, or even what the MEA might be on the airway I’m flying?
Readback: February 2013
Key Takeaways:
- GPS navigators lack comprehensive altitude guidance, such as step-down altitudes or MEAs, primarily because the underlying navigation database contains incomplete altitude data.
- Feedback on an approach lighting article highlighted the need for a "decoder ring" for AeroNav chart codes and related the concept of "cutoff angles" (visual shadows) to challenges in search and rescue visibility.
- A pilot shared a practical tip for managing interrupted checklists by marking completed items, allowing for easy resumption and enhancing safety.
- The "ARM APPROACH MODE PRIOR TO IAF" note on certain GPS approaches ensures the navigator switches to approach CDI sensitivity before Initial Approach Fixes (IAFs) located over 30 nautical miles from the airport.
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