In July 2013, we published “GPS Alphabet Soup” covering the five types of GPS approaches in some depth. A reader suggested a follow-on article with a table that gathers all the approach types and their key characteristics in one place. That seemed like a fine idea and it also affords us the opportunity to share some additional information.
Approach Secrets
Key Takeaways:
- The article clarifies the distinction between the official (ILS only) and practical definitions of a "precision approach," introducing "APV" (Approach with Vertical guidance) for those with surveyed vertical paths like LPVs.
- Modern GPS approaches, especially LP and LPV, leverage WAAS to provide highly precise angular deviation guidance that mimics and often surpasses traditional ILS, with LPVs now significantly outnumbering ILS procedures.
- Different approach types (GPS-based, ILS, VOR) are characterized by varying guidance methods (linear vs. angular), sources of vertical guidance (surveyed, advisory, baro-aiding), and specific obstacle clearance requirements, which can impact published minimums.
Key takeaways sponsored by Aviator Pro | Start Your Training ->
See a mistake? Contact us.
