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Garmin Marine Network Considerations
Some Garmin® MFD's / chartplotters can connect to additional Garmin Marine Network devices to share data such as radar, sonar and detailed mapping. When connecting Garmin Marine Network devices together keep these considerations in mind:
ALL devices connected to the Garmin Marine Network must be connected to the same ground. If multiple power sources are used for Garmin Marine Network devices, you must tie all ground connections from all power supplies together using a low resistance connection or tie them to a common ground bus bar, if available
A Garmin Marine Network cable must be used for all Garmin Marine Network Connections
Third-Party CAT5 cable and RJ-45 connectors must not be used for Garmin Marine Network connections
Additional Garmin Marine Network cables and connectors are available from Garmin
The NETWORK ports on the device each act as a network switch. Any compatible device can be connected to any NETWORK port to share data with all devices on the boat connected by a Garmin Marine Network cable
NOTE: Not all devices will communicate together over Marine Network even if they have a NETWORK port on the back. For further information Garmin Marine Network Sharing Compatibility