Garmin GHP 20 Marine Autopilot System for Steer-by-Wire, Installation Instructions Manual

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• If you have a powerboat, select Low Speed or High
Speed and adjust how tightly the rudder holds the
heading and makes turns at low speed or high speed.
If you set this value too high, the autopilot may be
overactive, attempting to constantly adjust the heading at
the slightest deviation. An overactive autopilot can drain
the battery at a faster-than-normal rate.
• If you have a powerboat, 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, and repeat steps 2–3 until
the autopilot performance is satisfactory.
Advanced Configuration
Advanced configuration options are not available on the helm
control under normal conditions. To access the advanced
configuration settings of the autopilot, you must first enable
Dealer Mode ( page 17 ).
Enabling Dealer Configuration
1
From the heading screen, select Menu > Setup > System >
System Information .
2
Hold the center key for 5 seconds.
Dealer Mode appears.
3
Select Back > Back .
If the option for Dealer Autopilot Configuration is available on
the Setup screen, the procedure was successful.
Advanced Configuration Settings
You can run the autotune process, calibrate the compass, and
define north on the autopilot without running the wizards. You
can also define each setting individually, without running the
configuration processes.
Running the Automated Configuration Processes Manually
1
Enable Dealer Mode ( page 17 ).
2
From the heading screen, select Menu > Setup > Dealer
Autopilot Configuration > Automated Setup .
3 Select Calibrate Compass , Set North , or Autotune .
4 Follow the on-screen instructions.
Defining Individual Configuration Settings Manually
Configuring certain configuration settings may require you to
modify other settings. Review the "Detailed Configuration
Settings" section ( page 19 ) prior to modifying any settings.
1
Enable Dealer Mode ( page 17 ).
2
From the heading screen, select Menu > Setup > Dealer
Autopilot Configuration .
3
Select a setting category.
4
Select a setting to configure.
Descriptions of each setting are available in the appendix
( page 19 ).
5
Configure the value of the setting.
Appendix
NMEA 0183 Connection Diagrams
These wiring diagrams are examples of different situations you
may encounter when connecting your NMEA 0183 device to the
helm control.
Two-Way NMEA 0183 Communication
>
>
>
>
>
>
>
>
À
NMEA 2000 network (provides power to the helm control)
Á
12 Vdc power source
Â
Helm control
Ã
NMEA 0183-compatible device
Wire Helm Control Wire Color —
Function
NMEA 0183-Compatible
Device Wire Function
Ê
N/A Power
Ë
N/A NMEA 0183 ground
Ì
Blue — Tx/A (+) Rx/A (+)
Í
White — Tx/B (-) Rx/B (-)
Î
Brown — Rx/A (+) Tx/A (+)
Ï
Green — Rx/B (-) Tx/B (-)
NOTE: When connecting a NMEA 0183 device with two
transmitting and two receiving lines, it is not necessary for the
NMEA 2000 bus and the NMEA 0183 device to connect to a
common ground.
Only One Receiving Wire
If your NMEA 0183-compatible device has only one receiving
wire (Rx), it must be connected to the blue wire (Tx/A) from the
helm control, and the white wire (Tx/B) from the helm control
must remain unconnected.
> >
>
>
>
>
À
NMEA 2000network (provides power to the helm control)
Á
12 Vdc power source
Â
Helm control
Ã
NMEA 0183-compatible device
Wire Helm Control Wire Color —
Function
NMEA 0183-Compatible
Device Wire Function
Ê
N/A Power
Ë
N/A NMEA 0183 ground
Ì
Blue — Tx/A (+) Rx
Í
White — unconnected N/A
Î
Brown — Rx/A (+) Tx/A (+)
Ï
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 0183
device must be connected to a common ground.
Only One Transmitting Wire
If your NMEA 0183-compatible device has only one transmitting
wire (Tx), it must be connected to the brown wire (Rx/A) from
17