Garmin GHP 20 Marine Autopilot System with SmartPump Installation Instructions Manual page 4

Item Description
Helm control
CCU
Helm control data cable
NMEA 2000 network
CCU cable
Pump
NMEA 2000 power
cable
4
Important Considerations
This is the compass ball.
This cable should be installed only if you are connecting the autopilot to optional NMEA 0183-compatible devices,
such as a wind sensor, a water-speed sensor, or a GPS device
The helm control and the CCU must be connected to a NMEA 2000 network using the included T-connectors
(page 2).
If there is not an existing NMEA 2000 network on your boat, you can build one using the supplied cables and
connectors (page 12).
To extend this cable to reach the pump, purchase the necessary extensions
This cable connects to the alarm and the shadow drive.
This diagram does not show any hydraulic connections. See
This cable should be installed 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
The NMEA 2000 power cable must be connected to a 9–16 Vdc power source.
(page 13)
page 6 for hydraulic-layout diagrams.
(page 2).
(page 1).