Garmin G500 Pilots Guide - Page 59

Foreword Sec 1 System 2.7.3 Vertical Deviation Indicator (VDI) The Vertical Deviation (Glideslope) Indicator (VDI) appears to the left of the VSI whenever an ILS frequency is tuned in the active NAV field. A green diamond acts as the VDI Indicator, like a glideslope needle on a conventional indicator. If a localizer frequency is tuned and there is no glideslope signal, "NO GS" is annunciated. The glideslope on an ILS approach is only shown if the current heading is within 90° of the selected course. This prevents the glideslope from being displayed during localizer backcourse approaches. Vertical Deviation Source Vertical Deviation Indicator Sec 2 PFD Sec 3 MFD Sec 4 Hazard Avoidance Features Sec 5 Additional Sec 6 Annun. & Alerts Figure 2-29 Vertical Deviation Indicator (ILS Source) The vertical deviation is similar to the glideslope for GPS approaches supporting WAAS vertical guidance (LNAV+V, L/VNAV, LPV) and is generated by the system to reduce pilot workload during approach. When an approach of this type is loaded into the flight plan and GPS is the selected navigation source, the Vertical Deviation Indicator appears as a magenta diamond. If the approach type downgrades to LNAV past the final approach fix (FAF), or the approach only supports LNAV service, "NO GP" is annunciated. Vertical Deviation Source Vertical Deviation Indicator Sec 7 Symbols Sec 8 Glossary Appendix A Figure 2-30 Vertical Deviation Indicator (GPS Source) Appendix B Index 190-01102-02 Rev. B Garmin G500 Pilot's Guide 2-19