GPS

The upper left button is the most important for Marine Navigation: it tells you if your screen is centered on the GPS position or not. Everytime you press this button you cycle between three map status that correspond to different icons on the screen, as follow:
GPS OFF In this status the screen map is NOT centered on the GPS position. This button icon will be shown everytime you pan or zoom manually.
GPS ON In this status the screen map is centered on the GPS position. If you want the map to follow your GPS position then this icon must be on the screen.
Map rotation Like the above but indicates that the GPS signal is provided by a NMEA gateway.
Map rotation In this status the screen map is rotating on the GPS position along the GPS heading direction.
Map rotation In this status the screen map is rotating on the GPS position along the bearing direction.

GPS positionRotation mode

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