Garmin G1000 Reference Manual page 128

Appendix
Magnetic Field Variation Database Update
At startup, the system compares this version of the MV DB with that presently being
used by each AHRS (GRS1 and GRS2). If the system determines the MV DB needs
to be updated, a prompt is displayed on the Navigation Map Page, as shown in the
following figure. Note, in the following example, GRS1 is the first AHRS to indicate
an update is available. In actuality, this is dependent on which AHRS is the first to
report status to the system. GRS2 may be displayed before GRS1. The order is not
important, only that both AHRS be updated.
GRS1 Magnetic Field Variation Database Update Prompt
Loading the magnetic field variation database update:
1) With 'OK' highlighted, as shown in the previous figure, press the ENT Key
on the MFD. A progress monitor is displayed as shown in the following
figure.
112
Garmin G1000 Cockpit Reference Guide for the Cessna Citation Mustang
Uploading Database to GRS1
190-00600-04 Rev. A