Garmin GMR 21/41 - Manual (Page 6)

4 GMR 21/41 Marine Radar Installation Instructions
Final Wiring Connections
Making the final wiring connections
1. Connect the Black ground (-) wire to the vessel’s negative power terminal.
2. Connect the Red power (+) wire (with fuse holder) to the vessel’s positive power terminal.
3. For a stand-alone network (MFD and radar only), attach the RJ-45 marine network cable to the RJ-45 socket on the back of the MFD.
For an expanded network (MFD, radar, GMS 10), attach the RJ-45 marine network cable to an open RJ-45 socket on the GMS 10
network power expander. Tighten the RJ-45 locking ring clockwise until it is firmly sealed.
GPS 17
Garmin
GPSMAP MFD
GMR 21/41 MARINE
RADAR
Stand Alone Network
Expanded Network
Garmin GMS 10
Marine Network Port Expander
to transducer
GMR 21/41
Marine Radar
Garmin GDL 30/30A
Marine Weather/Audio
Satellite Receiver
GA 31
GPS 17
GSD 20
Sounder Module
Garmin
GPSMAP MFD
Garmin
GPSMAP MFD