Garmin GTN 650Xi Series Pilot's Manual page 120

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REGIONAL POSITION FORMATS
By default, GTN Xi displays lat/lon for any positions outside the grid region.
British National Grid Irish National Grid
Grid Designator Easting Value Grid Designator Easting Value
Northing Value Northing Value
Swiss National Grid
Easting Value
Northing Value
2-76 Pilot's Guide 190-02327-03 Rev. C