The NMEA 2000 network will work properly as long as there is no more than 3 VDC drop in the supply voltage between the power source and the NMEA 2000 device located farthest from the power source on the NMEA 2000 network. To determine the voltage drop in your NMEA2000 network your certified NMEA 2000 installer will use the following equation:
Voltage Drop = Cable resistance (ohms/m) x Distance (from the battery to the farthest device, in metres) x Network Load x 0.1
Network Load equals the sum of Load Equivalent Numbers (LEN) between the battery and the end of the network. The LEN for each device should be visible on the device or provided in the device documentation.