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Alarm/Warning
Low CAN bus voltage
Low supply voltage
Nav data missing
Possible cause
CAN bus voltage < 9 V.
Supply voltage <10 V (12 V -15%).
Navigation data from Plotter/ECS
missing.
Recommended action
• Check cable length, bus load and bus supply feeding point
• If possible, check if fault disappears by disconnecting some
units.
• Check battery/charger condition
• Verify mains cable has correct gauge
• Check that route is activated on Plotter/MFD
• Check device list for valid navigation source
• Try a new automatic source update
• Check cables and connections
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