GHP12InstallationInstructions 5
Before installing the GHP 12 autopilot system, you must plan where all
the components will be located on your boat. Temporarily place all the
components where you intend to install them. Read these considerations
and consult the diagrams on pages 6 and 7 before you begin planning
your installation.
NOTE: There is an installation checklist on the last page of these
instructions. Remove the last page and refer to the checklist as you
proceed through the GHP 12 installation.
The GHP 12 components connect to each other and to power using the
included cables. Ensure that the correct cables reach each component
and that each component is in an acceptable location before mounting
or wiring any components.
• The drive unit is sold separately, and must be installed by an
experienced professional in order to correctly steer your boat.
• The drive unit must be installed before the ECU is permanently
mounted.
• The cables connected to the drive unit cannot be extended.
• If you using a non-Garmin drive unit, a GHP 12 drive unit power
cable (sold separately), and a GHP 12 rudder feedback cable (sold
separately) must be used to adapt your drive unit for use with the
GHP 12 (page 8).
The GHP 12 drive unit power cable cannot be extended.
• The ECU can be mounted on a at surface facing any direction.
• Mounting screws are included with the ECU, but you may need to
provide different screws if the supplied screws are not suitable for
the mounting surface.
• The ECU power cable connects to the boat battery, and it can be
extended if needed (page 8).
• The ECU must be located within 19 in. (0.5 m) of the drive unit.
• The cables connected to the drive unit cannot be extended.
• The CCU must be mounted in the forward half of the boat, no
higher than 10 ft. (3 m) above the waterline.
• The CCU or the ECU must not be mounted in a location where they
will be submerged or exposed to wash-down.
• The CCU must not be mounted near magnetic material,
magnets (speakers and electric motors), or high-current wires.
• The CCU must be mounted at least 24 in. (0.6 m) away from
movable or changing magnetic disturbances such as anchors, anchor
chain, wiper motors, and tool boxes.
• A handheld compass should be used to test for magnetic interference
in the area where the CCU is to be mounted.
If the handheld compass does not point north when you hold it in
the location you want to mount the CCU, then there is magnetic
interference. Choose another location and test again.
• The CCU can be mounted below the waterline if it is not in a
location where it will be submerged or exposed to wash-down.
• The CCU bracket must be mounted on a vertical surface or under a
horizontal surface, so that the connected wires hang straight down.
• Mounting screws are included with the CCU, but you may need to
provide different screws if the supplied screws are not suitable for
the mounting surface.
• The CCU/ECU interconnect cable connects the CCU to the ECU
and is 16 ft. (5 m) long.
◦ If the CCU cannot be mounted within 16 ft. (5 m) of the ECU,
replacement and extension cables are available (page 3).
◦ The CCU/ECU interconnect cable must not be cut.
• The CCU/ECU interconnect cable connects the CCU to the GHC 10
with a single yellow signal wire (page 9). The autopilot system will
not power on if this connection is not made.
• The alarm should be mounted near the helm station.
• The alarm can be mounted under the dashboard if you prefer.
• If needed, the alarm wires can be extended with 28 AWG (.08 mm
2
)
wire.
• The CCU and the GHC 10 connect to the NMEA 2000 network.
If your boat does not already have a NMEA 2000 network, one can
be built using the included NMEA 2000 cables and connectors
(page 12).
• To use advanced features of the GHP 12, optional NMEA
2000-compatible devices, such as a wind sensor, a water-speed
sensor, or a GPS device, can be connected to the NMEA 2000
network.
• The mounting location should provide optimal viewing as you
operate your vessel.
• The mounting location should allow easy access to the keys on the
GHC 10.
• The mounting surface must be strong enough to support the weight
of the GHC 10 and protect it from excessive vibration or shock.
• The area behind the surface must allow room for the routing and
connection of the cables.
There should be at least a 3-inch (8 cm) clearance behind the case of
the GHC 10.
• The location must be at least 9
1
/
2
in. (0.24 m) from a magnetic
compass, to avoid interference.
• The location must be in an area that is not exposed to extreme
temperature conditions (page 19).
• You must connect the GHC 10 to the NMEA 2000 network.
• For the autopilot to function, you must correctly connect two wires
from the GHC 10 data cable:
◦ The yellow wire from the GHC 10 data cable must be connected
to the yellow wire of the CCU/ECU interconnect cable.
◦ The black wire from the GHC 10 data cable must be connected
to the same ground as the ECU.
• Optional NMEA 0183-compatible devices, such as a wind sensor,
a water-speed sensor, or a GPS device, can be wired to the GHC 10
data cable (page 12).
