International Geomagnetic Reference Field - Garmin G500 Pilot's Manual

1.3

International Geomagnetic Reference Field

The IGRF (International Geomagnetic Reference Field) model is contained
in the AHRS 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
AHRS and in the Navigation Database are compared, and if the IGRF model
in the AHRS is out of date, the user is prompted to update the IGRF model in
the AHRS. After the G500H splash screen is acknowledged on the MFD, the
following update message appears.
For GRS 77/79:
GRS MV DB UPDATE AVAILABLE:
UPDATE AS FOLLOWS?
yyyy to yyyy
###-#####-## to ###-#####-##
To initiate the update process, follow the on-screen instructions.
1. When the Update message appears, press the ENT key with "OK" highlighted.
To update at another time, turn the Large knob to highlight "Cancel" and then
press ENT.
2. After the update is complete, press the ENT key to continue normal operation.
190-00601-02 Rev. J
GSU AHRS MV DB UPDATE AVAILABLE:
###-#####-## to ###-#####-##
Figure 1-17 GRS MV DB Update
Garmin G500/G600 Pilot's Guide
TOC
For GSU 75:
UPDATE AS FOLLOWS?
yyyy to yyyy
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