Garmin GHP 12 Autopilot System Installation Instructions - Page 3

GHP 12 Package Contents and Tools Needed The GHP 12 autopilot system consists of multiple components. Familiarize yourself with all of the components before beginning installation. You must know how the components operate together in order to correctly plan the installation on your boat. As you familiarize yourself with the GHP 12 components, confirm that your package includes the items listed below. All the components, except the drive unit and (optional) Shadow Drive, are included in the GHP 12 core box. The drive unit is sold separately (page 9). If any parts are missing, contact your Garmin dealer immediately. Record the serial number of each component in the space provided. Main Components The GHP 12 autopilot system consists of four main components: the Course Computer Unit (CCU), the Electronic Control Unit (ECU), the GHC™ 20 user control interface, and the drive unit (sold separately, see page 9). CCU GHC 20 The GHC 20 is the primary interface used to operate the GHP 12 autopilot system. Using the GHC 20, you engage and steer the GHP 12. You also set up and customize the GHP 12 using the GHC 20. The GHC 20 connects to a NMEA 2000 network to communicate with the CCU. The GHC 20 also connects with optional NMEA 2000-compatible devices, such as a wind sensor, a water-speed sensor, or a GPS device, to use advanced features of the GHP 12. If NMEA 2000-compatible devices are not available, you can connect the GHC 20 to optional NMEA 0183-compatible devices instead. Serial Number Shadow Drive The CCU acts as the brain of the GHP 12. The CCU contains the sensory equipment used to determine heading. The CCU connects to the ECU and to the GHC 20 with a single cable. The CCU also connects to a NMEA 2000® network to communicate with the GHC 20, and to optional NMEA 2000-compatible devices, such as a chartplotter and a wind sensor (page 12). Serial Number ECU The Shadow Drive (optional accessory) is a sensor you install in the hydraulic steering lines of your boat. The Shadow Drive can only be used on a boat with a hydraulic steering system. While the GHP 12 is engaged, the Shadow Drive temporarily disengages the autopilot when you manually take control of the helm. When you establish a new straight line heading, the Shadow Drive automatically reengages the autopilot Cables and Connectors The GHP 12 autopilot system includes multiple cables. These cables connect the components to power, to each other, to an alarm, and to optional devices. CCU/ECU Interconnect Cable This cable connects the CCU to the ECU. A portion of this cable contains color-coded wires with bare ends. These wires connect the CCU to the alarm and to the yellow wire from the GHC 20. The ECU connects to the CCU and to the drive unit. The ECU controls the drive unit based on information from the CCU. The ECU powers both the CCU and the drive unit. Serial Number GHP 12 Installation Instructions 3