Garmin Beil 407GX Cockpit Reference Manual page 151

Appendix
GRS Magnetic Field Variation Database Update Prompt
Loading the magnetic field variation database update:
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.
Uploading Database to GRS
When the upload is complete, the system is ready for use.
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™