1-17190-01102-02 Rev. B Garmin G500 Pilot’s GuideForewordSec 1SystemSec 2PFDSec 3MFDSec 4HazardAvoidanceSec 5AdditionalFeaturesSec 6Annun.& AlertsSec 7SymbolsSec 8Glossary Appendix AAppendix BIndexFigure 1-18 - Check Attitude - Autopilot Automatically DisconnectedFly the aircraft manually and crosscheck the GDU 620 attitude indicationwith the standby attitude indicator and other sources of attitude information(airspeed, heading, altitude, etc.).1.2.2 International Geomagnetic Reference FieldThe IGRF (International Geomagnetic Reference Field) model is contained inthe GRS 77 and is only updated once every five years. The IGRF model is part ofthe Navigation Database. At system power-up, the IGRF models in the GRS 77and in the Navigation Database are compared, and if the IGRF model in the GRS77 is out of date, the user is prompted to update the IGRF model in the GRS 77.The following prompt will appear after the G500 splash screen is acknowledgedon the MFD.GRS MV DB UPDATE AVAILABLE.UPDATE FROM yyyy TO yyyy(e.g. 2005 to 2010)Pressing the ENT key (or right-most soft key) acknowledges this informationand displays the Navigation Map Page. When the interfaced GPS unit hasacquired a sufficient number of satellites to determine a position, the aircraft’scurrent position is shown on the Navigation Map Page.1.3 System OperationNOTE: Refer to Section 6 for detailed descriptions of all alerts andannunciations.1.3.1 Using the Page MenusThe GDU 620 has a dedicated MENU key that when pressed displays acontext-sensitive list of options for functions in the MFD. This options list allows
