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Is there a way in iNavX to make the BTW (Bearing to waypoint) read magnetic bearings rather than true bearings? It is more useful when trying to sail to a compass to see magnetic bearings. I can't find any option or setting to make this adjustment.

Unselect "True Bearings" in the "Setup" on the "Instruments" view.

http://www.gpsnavx.com/iNavX/help/instruments.htm