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Aviation Alerts and Advisories

Service Advisory 1047 Rev A: LNAV/VNAV and LNAV+V Full Scale Deflection


All SBAS (WAAS) enabled Garmin Integrated Flight Decks (G1000/Cirrus Perspective/ Embraer Prodigy/G900X/G950), GPS 400WGNC 420W/GNS 430W/GPS 500W/GNS 530W, and SBAS (WAAS) enabled GNS 480/CNX80 units are affected.


CDI (Course Deviation Indicator)/HSI (Horizontal Situation Indicator) scaling on a limited number of LNAV/VNAV, and LNAV+V approaches is incorrect. LPV approaches and LNAV approaches without advisory (+V) vertical guidance are not affected.

For this to occur, all of the following conditions must be met:

  • Vector-to-Final has not been selected 
  • The approach is labeled “L/VNAV” or “LNAV+V” by the system 
  • The distance between the FAF (Final Approach Fix) and the MAP (Missed Approach Point) is greater than seven nautical miles 

A list of affected LNAV/VNAV approaches can be found here:


Beginning with the database cycles listed below, Garmin has removed the capability of selecting the affected approaches until this issue is addressed in a future software release.

  • Database cycle 1013, effective December 16, 2010 (Garmin Integrated Flight Deck Systems and GNS 400W/500W-series units) 
  • Database cycle 1103, effective March 10, 2011 (GNS 480/CNX80 units) 

Affected LNAV/VNAV and LNAV+V approaches will be available as LNAV-only approaches.

Download 1047