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GHP 20 Installation Instructions

GHC 10 Installation

Install the GHC 10 by flush-mounting it in the dashboard near the helm,  

and connecting it to a NMEA 2000 network.
To use advanced features of the GHP 20, optional NMEA 

2000-compatible or NMEA 0183-compatible GPS devices, can be 

connected to the NMEA 2000 network or connected to the GHC 10 

through NMEA 0183.

Mounting the GHC 10

Notice

The temperature range for the GHC 10 is from 5°F to 158°F (from 

-15°C to 70°C). Extended exposure to temperatures outside of this 

range (in storage or operating conditions) may cause failure of the 

LCD screen or other components. This type of failure and related 

consequences are not covered by the manufacturer’s limited warranty.
If you are mounting the GHC 10 in fiberglass, when drilling the 

four pilot holes, it is recommended to use a countersink bit to drill a 

clearance counterbore through only the top gel-coat layer. This will 

help to avoid any cracking in the gel-coat layer when the screws are 

tightened.
Stainless-steel screws may bind when screwed into fiberglass and 

overtightened. Garmin recommends applying an anti-galling, stainless 

anti-seize lubricant to the screws before installing them.
Before you can mount the GHC 10, you must select a mounting location 

(

page 5

). 

1.  Trim the flush-mount template and ensure it will fit in the location 

where you plan to mount the GHC 10.

  The flush-mount template is included in the product box, not in 

these instructions.

  The flush-mount template has adhesive on the back.
2.  Remove the protective liner from the adhesive on the back of the 

template and apply it to the location where you plan to mount the 

GHC 10. 

3.  If you will be cutting the hole with a jigsaw instead of a 3

17

/

32 

in. (90 

mm) hole saw, use a 

3

/

in. (10 mm) drill bit to drill a pilot hole as 

indicated on the template to begin cutting the mounting surface. 

4.  Using the jigsaw or the 3.5

 

in. (90 mm) hole saw, cut the mounting 

surface along the inside of the dashed line indicated on the flush-

mount template.

5.  If necessary, use a file and sandpaper to refine the size of the hole.
6.  Place the GHC 10 into the cutout to confirm that the four mounting 

holes are correct.

7.  Select an option:

•  If the mounting holes are correct, proceed to step 8.
•  If the mounting holes are not correct, mark the correct locations 

of the four mounting holes.

8.  Remove the GHC 10 from the cutout.
9.  Drill the four 

1

/

8

 in. (3.2 mm) pilot holes. 

  If you are mounting the GHC 10 in fiberglass, use a countersink bit 

as advised in the Notice.

10. Remove the remainder of the template.
11. Place the GHC 10 into the cutout.
12. Securely fasten the GHC 10 to the mounting surface using the 

supplied screws.

  If you are mounting the GHC 10 in fiberglass, use a anti-galling 

lubricant as advised in the Notice.

13. Snap the mounting covers 

 into place.

Connecting the GHC 10

Connect the GHC 10 to the NMEA 2000 network using the included 

NMEA 2000 drop cable (

page 8

).

Multiple GHC 10 Considerations

You can install multiple GHC 10 devices (sold separately) to control the 

autopilot from different locations on the boat.
•  All additional GHC 10 devices must be at software version 4.0 or 

later.

•  All additional GHC 10 devices must be connected to the 

NMEA 2000 network (

page 8

).

Connecting the Devices to a nMEa 2000 

network

Notice

If you have an existing NMEA 2000 network on your boat, it should 

already be connected to power. Do not connect the included NMEA 

2000 power cable to an existing NMEA 2000 network, because only 

one power source should be connected to a NMEA 2000 network.
You can connect the GHC 10 to the CCU through an existing NMEA 

2000 network. If you do not have an existing NMEA 2000 network on 

your boat, all the parts needed to build one are supplied in the GHP 20 

package (

page 10

).

To use advanced features of the GHP 20, an optional NMEA 

2000-compatible GPS device can be connected to the NMEA 2000 

network.
For more information on NMEA 2000, go to 

www.garmin.com

.

Summary of Contents for GHP 20

Page 1: ...mbers are located on a sticker on each component 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 Important Safety Information Warnings You are responsible for the safe and prudent operation of your vessel The GHP 20 is ...

Page 2: ... 2000 Network for the GHC 10 and the CCU 10 Connecting Optional Devices to the GHP 20 Autopilot System 10 NMEA 0183 Connection Considerations 10 Connecting an Optional NMEA 0183 compatible Device to the GHC 10 10 Configuring the GHP 20 11 About the Dockside Wizard 11 Performing the Dockside Wizard 11 Starting the Dockside Wizard 11 Testing the Steering Direction 11 Selecting the Speed Source 11 Ve...

Page 3: ...th the CCU The GHC 10 also connects with optional NMEA 2000 compatible devices such as a GPS device to use advanced features of the GHP 20 If NMEA 2000 compatible devices are not available you can connect the GHC 10 to optional NMEA 0183 compatible devices instead Serial Number Cables and Connectors The GHP 20 autopilot system includes multiple cables These cables connect the components to power t...

Page 4: ...eded Safety glasses Drill and drill bits 3 1 2 in 90 mm hole saw Wire cutters strippers Phillips and flat screwdrivers Cable ties Waterproof wire connectors wire nuts or heat shrink tubing and a heat gun Marine sealant Portable or handheld compass to test for magnetic interference when determining the best location to install the CCU Anti seize lubricant optional Note Mounting screws are provided ...

Page 5: ...s NOTICE Do not connect the steering controller cable to a NMEA 2000 network The GHP 20 requires a powered CAN bus to communicate with the steering controller Ensure that the steering controller CAN bus is properly powered and terminated Consult the boat manufacturer if needed The steering controller cable connects the CCU to the steering controller of the boat and provides 9 5 ft 3 m of cable bet...

Page 6: ...ne using the supplied cables and connectors page 10 NMEA 2000 power cable This cable should be installed only if you are building a NMEA 2000 network Do not install this cable if there is an existing NMEA 2000 network on your boat page 10 The NMEA 2000 power cable must be connected to a 9 16 Vdc power source CCU Mount the CCU with the cables pointing straight down page 7 Steering controller cable ...

Page 7: ...y in the bracket Do not overtighten the thumbscrew Connecting the CCU 1 Route the five pin connector end of the steering controller cable to the steering system access location on your boat page 7 2 Route the orange and blue wires to the location where you plan to install the alarm page 7 If the cable is not long enough extend the appropriate wires with 28 AWG 08 mm2 wire Alarm Installation The al...

Page 8: ...Using the jigsaw or the 3 5in 90 mm hole saw cut the mounting surface along the inside of the dashed line indicated on the flush mount template 5 If necessary use a file and sandpaper to refine the size of the hole 6 Place the GHC 10 into the cutout to confirm that the four mounting holes are correct 7 Select an option If the mounting holes are correct proceed to step 8 If the mounting holes are n...

Page 9: ...ble up to 20 ft 6 m long not included 6 Connect the drop cable to the to the GHC 10 7 Connect the drop cable to the T connector you added in step 3 and to the GHC 10 Connecting the CCU to an Existing NMEA 2000 Network 1 Determine where to connect the CCU to your existing NMEA 2000 backbone page 5 2 Disconnect one side of a NMEA 2000 T connector from the network 3 If necessary to extend the NMEA 20...

Page 10: ...optional NMEA 2000 compatible or NMEA 0183 compatible GPS device can be connected to the NMEA 2000 network or to the GHC 10 through NMEA 0183 NMEA 0183 Connection Considerations To identify the Transfer Tx A and B wires for your NMEA 0183 compatible device consult the installation instructions for your device When connecting NMEA 0183 devices with two transmitting and two receiving lines it is not...

Page 11: ...it does not appear on the GHC 10 proceed to the next step 1 Use the arrows on the GHC 10 to test the steering direction When you select the right arrow the rudder should turn so that the boat would steer to the right and when you select the left arrow the rudder should turn so that the boat would steer to the left 2 Select Continue 3 Select an option If the steering test turns the boat in the corr...

Page 12: ...eps 1 3 Performing the Autotune Procedure Before you can perform the autotune procedure you must have a large stretch of open water available 1 Adjust the throttle so the boat travels below planing speed 2 Select Begin The boat performs a number of zigzag motions while the Autotuning is in progress The GHC 10 displays a completion message 3 Select an option If the autotune completed successfully s...

Page 13: ...ear and tear on the drive unit and drains the battery at a faster than normal rate Select Low Speed Counter or High Speed Counter to adjust how tightly the rudder corrects the turn overshoot If you set this value too high the autopilot can overshoot the turn again when attempting to counter the original turn 4 Test the autopilot configuration 5 Repeat steps 2 and 3 until the GHP 20 performance is ...

Page 14: ...the GHC 10 unconnected GHC 10 NMEA 2000 network provides power to the GHC 10 12 VDC power source NMEA 0183 compatible device Wire GHC 10 Wire Color Function NMEA 0183 Compatible Device Wire Function N A Power N A NMEA 0183 ground Blue Tx A Rx White unconnected N A Brown Rx A Tx A Green Rx B Tx B NOTE When connecting a NMEA 0183 device with only one receiving Rx line the NMEA 2000 bus and the NMEA ...

Page 15: ... 126996 Product Information 127258 Magnetic Variation 127488 Engine Parameters Rapid Update 129025 Position Rapid Update 129026 COG SOG Rapid Update 129283 Cross Track Error 129284 Navigation Data Transmit 059392 ISO Acknowledgment 059904 ISO Request 060928 ISO Address Claim 126208 NMEA Command Request Acknowledge Group Function 126464 Transmit Receive PGN List Group Function 126996 Product Inform...

Page 16: ...or low speeds This setting applies to the vessel when operating below planing speed If you set this value too high the autopilot may be overactive attempting to constantly adjust the heading at the slightest deviation Rudder Gains Low Speed Counter Allows you to set the rudder gain counter correction for low speeds This setting applies to the vessel when operating below planing speed If you set th...

Page 17: ...he GHP 20 See the configuration section of the GHC 10 Owner s Manual for more information Error and Warning Messages Error Message Cause Autopilot Action Autopilot is not receiving navigation data Autopilot placed in heading hold The autopilot is no longer receiving valid navigation data while performing a Route To This message will also be shown if navigation is stopped on a chartplotter prior to...

Page 18: ......

Page 19: ...wing the directions starting on page 5 Mount the CCU in a location free of magnetic interference Use a handheld compass to test for magnetic interference in the area Mount the CCU in the bracket so that the wires hang straight down 4 Mount the GHC 10 by following the directions starting on page 5 5 Connect the CCU to the steering system of the boat using the steering controller cable page 7 6 Conn...

Page 20: ...hout obligation to notify any person or organization of such changes or improvements Visit the Garmin Web site www garmin com for current updates and supplemental information concerning the use and operation of this and other Garmin products Garmin and the Garmin logo are registered trademarks of Garmin Ltd or its subsidiaries registered in the USA and other countries GHP GHC and myGarmin are trad...

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