Considerations for Existing NMEA 2000 Networks

If a boat has an existing NMEA 2000® installation, and you would like to add Garmin® NMEA 2000 equipment, you should observe these considerations.
Cable and Connector Type

Garmin uses NMEA 2000 micro connectors for all cables and connectors. An existing NMEA 2000 network may use NMEA 2000 mini connectors and cables in the backbone. Mini connectors are larger than micro connectors, so you must use a converter or adapter to connect a Garmin NMEA 2000 device to a backbone with mini connectors.


You must determine whether the existing NMEA 2000 network is connected to a power source, because an NMEA 2000 network must connect to power to function correctly (Power Connection Considerations). If you must connect power to the NMEA 2000 network at more than one location, you must install a power isolator in the backbone between the two power connections (Power Isolation).


You must determine whether terminators are installed on the ends of the existing NMEA 2000 backbone, because anNMEA 2000 network must be properly terminated to function correctly. You must not add more terminators to an NMEA 2000 network if it is already properly terminated.

If you are unsure of any of these considerations, you should contact your boat manufacturer or a certified NMEA 2000 technician for assistance.

Copyright © Garmin. All rights reserved.GUID-1415AAD0-FE63-42A6-8F8D-DB713D616122 v1