Skip navigation links
Unsupported Browser Detected – For best results, please update your browser.

Aviation Alerts and Advisories

Service Advisory 1344 Rev B: LPV and LNAV/VNAV Approach Full Scale Deflection


All SBAS (WAAS) enabled GPS 400W, GNC 420W, GNS 430W, GPS 500W, GNS 530W, GTN 625, GTN 635, GTN 650, GTN 725, GTN 750, Cirrus Perspective®, Embraer Prodigy™, G1000, G2000, G3000, G5000, G900X, G950 products are affected by this advisory.


CDI (Course Deviation Indicator)/HSI (Horizontal Situation Indicator) scaling on a limited number of LPV and LNAV/VNAV approaches are incorrect. Vertical guidance is not affected by this issue. As this behavior is not in strict compliance with TSO-C146, Garmin has applied for and received a TSO deviation from the FAA as the affected equipment provides an equivalent level of safety. With the granted deviation the affected equipment is fully compliant with the applicable regulatory regulations.

This issue affects only LPV and LNAV/VNAV approaches where the final approach segment termination waypoint is offset from the landing threshold.

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


Beginning with database cycle 1307, Garmin has removed the capability of selecting the affected approaches for LPV or LNAV/VNAV use until this issue is addressed in a future software release.

Download 1344B