Build or expand your basic NMEA 2000 network on your boat. Use Garmin NMEA 2000 power isolator to ensure that sources that could power the bus are properly disconnected during the installation of the NMEA 2000 network. In some cases, NMEA 2000 capable motors could power the NMEA 2000 bus. This current insulator is useful as it ensures that the power of the motors is kept separate from the system performance.