Garmin GHP 12 Autopilot System Installation Manual download pdf



To obtain the best performance and to avoid damage to your boat, install

the Garmin

Class B Drive Unit according to the following instructions.

Professional installation of the drive unit is highly recommended, because

specic knowledge of rudder operation is required to properly install the

drive unit.



If you experience difculty during the installation, contact Garmin Product

Support.



The Class B drive unit is a self-contained hydraulic drive unit that uses a

solenoid clutch to extend and retract the rod that steers the tiller. Combined

with the included rudder feedback sensor, the Garmin Class B Drive unit

will provide the steering necessary for a Garmin autopilot when installed

correctly.

Because the drive unit is self-contained, you do not need to connect or

disconnect any of the hydraulic hoses. The system was lled and tested at the

factory.



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.



Contact Garmin Product Support if you have any questions about this

product.

• In the USA, go to www.garmin.com/support, or contact Garmin USA by

phone at (913) 397.8200 or (800) 800.1020.

• In the UK, contact Garmin (Europe) Ltd. by phone at 0808 2380000.

• In Europe, go to www.garmin.com/support and click 

for in-country support.









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 autopilot

product box for product warnings and other important information.





Failure to install and maintain this equipment in accordance with these

instructions could result in damage or injury.

When in use, beware of hot motor and solenoid components, as well as the

risk of entrapment from moving parts

Always wear safety goggles, ear protection, and a dust mask when drilling,

cutting, or sanding.

Notice

This equipment should be installed by a qualied marine installer.

This equipment is only for use with Garmin autopilots.

The system was lled and tested at the factory, so you should not disconnect

the hydraulic hoses to install the system.

When drilling or cutting, always check the opposite side of the surface. Be

aware of fuel tanks, electrical cables, and hydraulic hoses.

March 2011 190-01289-06 Rev. B Printed in the UK

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Summary of Contents

Page 1 - 

To obtain the best performance and to avoid damage to your boat, install the Garmin® Class B Drive Unit ac

Page 2 - 

Page 3 - 

2 ClassBDriveUnitInstallationInstructions➊ ➋➌➍➎➏➐➑➊Reservoir➋Cylinder/ram➌Tiller bolt and ttingsSuitable for a quadrant or till

Page 4

ClassBDriveUnitInstallationInstructions 3NoticeThe reservoir is tted with a special cap that contains a breather hole.

Page 5 - 

4 ClassBDriveUnitInstallationInstructions2. Verify the marked locations. The marked locations should be 3 in. (76.2 mm) ➊ apart.  The di

Page 6 - 

ClassBDriveUnitInstallationInstructions 5• To maximize the life of your drive unit, take the followin

Page 7 - 

6 ClassBDriveUnitInstallationInstructions  Motor Nominal output power 100 WMaximum continuous cur

Page 8

ClassBDriveUnitInstallationInstructions 7 ➊5.85 in. (148.7 mm)➋3/8 in. (9.5 mm) diameter➌2.18 in. (55.3 mm)➊➌

Page 9 - 

8 ClassBDriveUnitInstallationInstructionsBA➊➋➌➍➎➏➏➐➑ ➑➒➓  ➊Pivot radius of the cylinde

Page 10

ClassBDriveUnitInstallationInstructions 9This example shows a typical cylinder installation on a 8.4 in. (214 mm) quadr