International Geomagnetic Reference Field; System Operation; Using The - Garmin G500 Pilot's Manual

Figure 1-18 - Check Attitude - Autopilot Automatically Disconnected
Fly the aircraft manually and crosscheck the GDU 620 attitude indication
with the standby attitude indicator and other sources of attitude information
(airspeed, heading, altitude, etc.).
1.2.2

International Geomagnetic Reference Field

The IGRF (International Geomagnetic Reference Field) model is contained in
the GRS 77 and is only updated once every five years. The IGRF model is part of
the Navigation Database. At system power-up, the IGRF models in the GRS 77
and in the Navigation Database are compared, and if the IGRF model in the GRS
77 is out of date, the user is prompted to update the IGRF model in the GRS 77.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 acknowledged
on 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 information
and displays the Navigation Map Page. When the interfaced GPS unit has
acquired a sufficient number of satellites to determine a position, the aircraft' s
current position is shown on the Navigation Map Page.
1.3

System Operation

NOTE: Refer to Section 6 for detailed descriptions of all alerts and
annunciations.
1.3.1 Using the Page Menus
The GDU 620 has a dedicated MENU key that when pressed displays a
context-sensitive list of options for functions in the MFD. This options list allows
190-01102-02 Rev. B Garmin G500 Pilot's Guide
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