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n the system setup, under “UNITS” I set
BEARING to “MAG” (magnetic). This will cause the unit to display course /
bearing information in relation to the Magnetic North and match magnetic
compass readings. It is not the same as True North! One has to be careful with
this setting. There are a number of areas where the earth's magnetic field is
locally disturbed, sometimes very significantly. Your GPS may not account for
it.-again, under “UNITS” I set “METRIC”.
Check to see if this is a power issue by connecting to shore power and fully charging your batteries overnight with instruments off. While still connected to shore power, with batteries fully charged, turn on C80 navigation system. If the loading screen comes on and does not reset, then try holding down the button immediately to the right of the red power button for at least 3 seconds to see if the system re-boots.
I think you have a C- Map card (black colour)clean the contacts with a contactcleaner if it not works try the card somewhere else
The C-Map card have problems that they work for a while and than stops inside the card a some memorychips and they losing contact
There is a feature in these chartplotters called "Plotter Mode" that is often misunderstood and causes the exact problem you describe.
Press menu.....chart setup.....and scroll to the bottom until you see Plotter Mode in the list of options. It should be set in the OFF position.
If you have more than one display networked onboard check the setting in each one invividually.
What Plotter Mode does is allows the chartplotter system to access range scales not supported on the chart. It is not normally used for map-based navigation but more so for chartless electronic plotting (it can display routes, waypoints and track-recorder breadcrumbs.) open-ocean cruising, or for ultra-precise GPS operations (like a precision anchor drop, finding a very specific location etc. When plotter mode is on you can zoom in to a very, very small working area. The indicator it is enable is the cross-hatch background on the screen, the lack of map information, and the NO CHART DATA watermark on the screen.