Garmin GHP 12 Autopilot System Installation Instructions

Garmin GPS Installation Instructions - GHP 12 Autopilot System.
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Class B Compact Drive Unit 

Installation Instructions 

To obtain the best performance and to avoid damage to your 

boat, install this drive unit according to these instructions. 

Professional installation of the drive unit is highly 

recommended, because specific knowledge of rudder operation 

is required to properly install the drive unit. Read all installation 

instructions before proceeding with the installation. If you 

experience difficulty during the installation, contact Garmin® 

Product Support.

Important Safety Information

 WARNING

You are responsible for the safe and prudent operation of your 

vessel. The autopilot is a tool that will enhance your capability to 

operate your boat. It does not relieve you from the responsibility 

of safely operating your boat. Avoid navigational hazards and 

never leave the helm unattended.
See the Important Safety and Product Information guide in the 

product box for product warnings and other important 

information.

 CAUTION

When in use, beware of hot motor and solenoid components 

and the risk of entrapment from moving parts.
Always wear safety goggles, ear protection, and a dust mask 

when drilling, cutting, or sanding.

NOTICE

To avoid damage to your boat, the autopilot system should be 

installed by a qualified marine installer. Specific knowledge of 

hydraulic steering componentry and marine electrical systems is 

required for proper installation.
The drive unit movement must be limited by physical end stops. 

Failure to install end stops will cause the drive unit to act as a 

travel limiter and will damage the drive unit.
When drilling or cutting, always check what is on the opposite 

side of the surface.

Registering Your Device
Help us better support you by completing our online registration 

today.
• Go to http://my.garmin.com.
• Keep the original sales receipt, or a photocopy, in a safe 

place.

Contacting Garmin Product Support
• Go to www.garmin.com/support and click Contact Support 

for in-country support information.

• In the USA, call (913) 397.8200 or (800) 800.1020.
• In the UK, call 0808 2380000.
• In Europe, call +44 (0) 870.8501241.

Tools Needed
• Tiller arm (if needed)
• End stops to limit rudder travel (if not already present on the 

boat)

• Safety glasses
• Drill and drill bits

• Wrenches
• Torque wrench
• Loctite® 638™ retaining compound or equivalent 

(recommended)

• Hex or allen wrenches (for removing the device from the 

base for maintenance or repair)

Mounting Location Considerations

NOTICE

This device should be mounted in a location that is not exposed 

to extreme temperatures or conditions. The temperature range 

for this device is listed in the product specifications. Extended 

exposure to temperatures exceeding the specified temperature 

range, in storage or operating conditions, may cause device 

failure. Extreme-temperature-induced damage and related 

consequences are not covered by the warranty.

When selecting a mounting location, observe these 

considerations.
• The drive unit must be installed under deck, in a location not 

subject to flooding or washdown.

• The drive unit must be mounted securely on a surface that is 

able to withstand the high thrusts generated by the rudder.

• The drive unit must be installed within specific extension and 

angle limitations, as defined in the specifications at the end 

of these instructions.

• The drive unit movement must be limited by physical stops, 

and not by the length of the drive unit rod, or damage to the 

drive unit will occur.

• No part of the drive unit or rod should contact the vessel, 

quadrant, or tiller arm throughout the full range of movement.

• The 10° tilt at the extremes of the stroke must not be 

exceeded, or damage to the drive unit will occur.

Tiller Arm and End Stop Considerations
You can connect the drive unit to either an existing quadrant or 

to a tiller arm (not included). If you do not have a quadrant or 

cannot install the drive unit at your quadrant location, choose a 

tiller arm that fits the diameter of your rudder post and is the 

correct length for the installation location.
The supplied tiller bolt is suitable for a quadrant or tiller arm 

thickness of 12 mm (0.47 in.) to 16 mm (0.63 in.).
The drive unit must not act as a rudder-movement limiter. 

Physical end stops (not included) must be in place to limit the 

drive-unit travel to 254 mm (10 in.) from fully retracted to fully 

extended, or damage to the drive unit will occur.

Mounting the Drive Unit
Hardware is supplied to fasten the drive unit to the mounting 

surface. The supplied M8 bolts, washers, and nuts are suitable 

for mounting the cylinder on a surface between 12 mm (0.47 in.) 

and 24 mm (0.95 in.) thick.
With the drive unit in the mounting location, mark the 

locations of the four mounting holes on the surface.

Verify the marked locations.

The marked locations should be 76.2 mm (3 in.) apart .

Drill 8.8 mm (0.35 in.) holes through the mounting surface.
Secure the drive unit to the mounting surface using the 

supplied M8 bolts, washers, and nuts.

Tighten the bolts to 17 Nm (12.5 ft-lbf).

Installing the Tiller Pin
The supplied tiller bolt is suitable for a quadrant or tiller arm 

thickness of 12 to 16 mm (0.47 to 0.63 in.).

April 2013

190-01289-03_0A

Printed in the UK

0.479912s