Garmin GHC 50 Marine Autopilot Instrument Installation Instructions GHC 50 - Page 4

Connection Considerations NOTICE If you are connecting to an existing NMEA 2000® network, identify the NMEA 2000 power cable. Only one NMEA 2000 power cable is required for the NMEA 2000 network to operate properly. A NMEA 2000 Power Isolator (010-11580-00) should be used in installations where the existing NMEA 2000 network manufacturer is unknown. If you are installing a NMEA 2000 power cable, you must connect it to the boat ignition switch or through another in-line switch. NMEA 2000 devices will drain your battery if the NMEA 2000 power cable is connected to the battery directly. The helm control must connect to the same NMEA 2000 network as the other autopilot components for the autopilot system to function correctly. The NMEA 2000 network provides power to the helm control and allows for communication with the other autopilot components and from NMEA 2000 devices such as a GPS antenna or a wind sensor. This device is powered by the NMEA 2000 network, and a separate power connection is not required. If you are unfamiliar with NMEA 2000, you should read the "NMEA 2000 Network Fundamentals" chapter of the Technical Reference for NMEA 2000 Products. To download the reference, go to garmin.com/manuals/nmea _2000. You can also connect this device to Garmin® Marine Network devices using a 9-pin Garmin Marine Network cable (sold separately). You must use the included adapter to connect to Garmin network devices that have a larger connector. This optional connection is not required for the helm control to function with the autopilot system, but it is recommended for software updates if a Garmin chartplotter is present on the network. This device cannot be updated using only a NMEA 2000 network connection. See the installation instructions provided in the corepack of your autopilot system for detailed connection information specific to the type of autopilot needed for your boat. This connection diagram shows only the general connection needs of the helm control. GHC 50 helm control Garmin Marine Network cable (recommended for software updates) NMEA 2000 power cable You should install this cable only if you are building a NMEA 2000 network. Do not install this cable if there is an existing NMEA 2000 network on your boat. You must connect the NMEA 2000 power cable to a 9 to 16 Vdc power source. NMEA 2000 network 4