Originally Posted by MarkSF
I don't see why that would cause problems - it is fine to feed NMEA 2000 with power in more than one location (as long as the polarity is the same!) to overcome voltage drops in long cable runs.
This is not what Garmin say
If you have an existing NMEA 2000 network on your boat, it should alreay be connected to power. Do not connect the included NMEA 2000 power cable to an existing NMEA 2000 network, because only one power source should be connected to a NMEA 2000 network.
If you need to insert power into the N2K network at different segments the segments need to be insulated (not necessary on an average boat).
More on Garmin Networking and power supply here
The GMI 10 manual is not clear on connecting the GMI 10 to NMEA 0183 and NMEA 2000 at the same time...
More one NMEA 2000 networking here http://www.maretron.com/products/pdf...on%20Guide.pdf