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• To avoid interference with a magnetic compass, the device
should not be installed closer to a compass than the
compass-safe distance value listed in the product
specifications.
• The area behind the mounting surface must allow room for
routing and connecting the cables.
Helm Control Connection Considerations
A dedicated helm control is not included in all autopilot
packages. If you install the autopilot without a dedicated helm
control, the autopilot CCU must be connected to the same
NMEA 2000 network as a compatible Garmin chartplotter to
configure and control the autopilot system.
• The helm control must connect to the NMEA 2000 network.
• Optional NMEA
0183 devices, such as wind sensors, water-
®
speed sensors, or GPS devices can be connected to the
helm control using a NMEA data cable
Connection Considerations, page
CCU Mounting and Connection Considerations
• The CCU is the primary sensor of the GHP Compact Reactor
Hydraulic autopilot system. For best performance, observe
these considerations when selecting a mounting location.
◦ A handheld compass should be used to test for magnetic
interference in the area where the CCU is to be mounted.
If the needle on a handheld compass moves when you
hold it where you intend to mount the CCU, magnetic
interference is present. You must choose another location
and test again.
◦ The CCU should be mounted on a rigid surface for best
performance.
• Mounting screws are provided with the CCU. If you use
mounting hardware other than the provided screws, the
hardware must be quality stainless or brass material to avoid
magnetic interference with the CCU.
Test any mounting hardware with a handheld compass to
make sure no magnetic fields are present in the hardware.
Finding the Best Mounting Location
1
Create a list of all suitable mounting locations for the CCU
where no iron, magnets, or high-current wires are located
within 60 cm (2 ft.).
A large magnet, such as a subwoofer-speaker magnet should
be no closer than 1.5 m (5 ft.) to these locations.
2
Locate the center of rotation of the boat, and measure the
distance between the center of rotation and each of the
suitable mounting locations you listed in step 1.
3
Select the location closest to the center of rotation.
If more than one location is approximately the same distance
from the center of rotation, you should select the location that
best meets these considerations.
• The best location is closest to the centerline of the boat.
• The best location is lower in the boat.
• The best location is slightly forward in the boat.
ECU Mounting and Connection Considerations
• The ECU can be mounted on a flat 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 must be mounted within 0.5 m (19 in.) of the pump.
◦ The cables connecting the ECU to the pump cannot be
extended.
• The ECU must be mounted in a location where it will not be
submerged or exposed to wash down.
2
(NMEA 0183
9).
• The ECU power cable connects to the boat battery, and it
can be extended if needed
page
7).
Pump Mounting Considerations
Consult the hydraulic-layout diagrams in these instructions to
help determine the pump-installation location
Layouts, page
4).
• The pump must be mounted at a location to which you can
extend the hydraulic steering lines of the boat.
• The pump should be mounted horizontally if possible.
• If the pump must be mounted vertically, with the hydraulic
connections facing upward.
Shadow Drive Mounting Considerations
NOTE: The Shadow Drive is a sensor you install in the hydraulic
steering lines of your boat. It detects when you manually take
control of the helm and suspends autopilot control of the boat.
NOTE: If your autopilot package does not include a Shadow
Drive, you should install a manual switch to disable the autopilot
if needed.
• The Shadow Drive must be mounted horizontally and as level
as possible, with cable ties firmly securing it in place.
• The Shadow Drive must be mounted at least 305 mm (12 in.)
away from magnetic materials or devices, such as speakers
or electric motors.
• The Shadow Drive should be mounted closer to the helm
than to the pump.
• The Shadow Drive should be mounted lower than the helm,
but higher than the pump.
• The Shadow Drive must not be connected directly to the
fitting at the back of the helm. There must be a length of hose
between the fitting at the helm and the Shadow Drive.
• The Shadow Drive must not be connected directly to a
hydraulic T-connector in the hydraulic line. There must be a
length of hose between a T-connector and the Shadow Drive.
• In a single-helm installation, there must not be a T-connector
between the helm and the Shadow Drive.
• In a dual-helm installation, the Shadow Drive should be
installed between the pump and the hydraulic T-connector
that leads to the upper and lower helm, closer to the helm
than to the T-connector.
• The Shadow Drive must be installed in either the starboard
steering line or the port steering line.
The Shadow Drive must not be installed in either the return
line or the high-pressure line, if applicable.
Autopilot Switch Mounting and Connection Considerations
If your autopilot package does not include a Shadow Drive
valve, you should install a manual Single Pole Single Throw
(SPST) switch (not included) to disable the autopilot if
necessary.
The switch should be installed near the primary helm, so it is
easily accessible when operating the boat.
The switch should be connected to the same wires that connect
a Shadow Drive valve.
If needed, the wires can be extended with 28 AWG (0.08 mm
wire.
Alarm Mounting and Connection Considerations
• The alarm should be mounted near the primary helm station.
• The alarm can be mounted under the dashboard.
• If needed, the alarm wires can be extended with 28 AWG
2
(0.08 mm
) wire.
NMEA 2000 Connection Considerations
• The CCU and the helm control must connect to a NMEA
2000 network.
(Power Cable Extensions,
(Hydraulic
2
)
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