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

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Type PGN Description
129284 Navigation Data
129540 GNSS Satellites in View
130306 Wind Data
Receive only 127245 Rudder Data
127250 Vessel Heading
127488 Engine Parameters - Rapid Update
128259 Water Speed
129025 Position - Rapid Update
129029 GNSS Position Data
129283 Cross-Track Error
129284 Navigation Data
129285 Navigation - Route/WP information
130306 Wind Data
130576 Small Craft Status
NMEA 0183 Information
When connected to optional NMEA 0183-compatible devices,
the autopilot uses the following NMEA 0183 sentences.
Type Sentence
Transmit hdg
Receive wpl
gga
grme
gsa
gsv
rmc
bod
bwc
dtm
gll
rmb
vhw
mwv
xte
Error and Warning Messages
Error Message Cause Autopilot Action
ECU Voltage is Low The pump supply
voltage has fallen below
10 Vdc for longer than 6
seconds.
• Alarm sounds for 5
seconds
• Continues in normal
operation
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
maneuver.
This message also
appears if navigation is
stopped on a
chartplotter before the
autopilot is disengaged. • Alarm sounds for 5
seconds
• Autopilot transitions
to heading hold
Connection with
Autopilot Lost The helm control has
lost connection with the
CCU. N/A
Lost Wind Data
(sailboat only) The autopilot is no
longer receiving valid
wind data. • Alarm sounds for 5
seconds
• Autopilot transitions
to heading hold
Low GHC™ Supply
Voltage The supply voltage level
has fallen below the
value specified in the
low voltage alarm menu. N/A
Error Message Cause Autopilot Action
Error: ECU High
Voltage The pump supply
voltage has risen above
33.5 Vdc. • The ECU shuts
down
Error: ECU Voltage
has Dropped
Rapidly The ECU voltage has
dropped quickly below
7.0 Vdc. • Alarm sounds until
acknowledged.
• The error is cleared
when the ECU
voltage rises above
7.3 Vdc.
Error: ECU High
Temperature The ECU temperature
has risen above 212°F
(100°C). • Alarm sounds for 5
seconds
• Pump is disabled
Error: Lost
Communication
Between ECU and
CCU (when the
autopilot is
engaged) Communication between
the CCU and the pump
has timed out. • The helm control
beeps, and autopilot
transitions to
standby.
Detailed Configuration Settings
Although all of the configuration is typically completed
automatically through wizards, you can manually adjust any
setting to fine-tune the autopilot.
Advanced configuration settings are available only when using
Dealer Mode ( page 17 ). User-specific settings are available
during normal operation of the autopilot. See the configuration
section of the owner's manual provided with the autopilot for
more information.
NOTE: Depending upon the configuration of the autopilot,
certain settings may not appear.
NOTE: On a powerboat, each time you change to the Speed
Source setting, you must review the Verify Tachometer , Low
RPM Limit , High RPM Limit , Planing RPM , Planing Speed , or
Max. Speed settings, where applicable, before performing the
autotune procedure ( page 16 ).
Autopilot Tuning Settings
To open the general autopilot tuning settings, select Menu >
Setup > Dealer Autopilot Configuration .
Acceleration Limiter : Allows you to limit the speed of autopilot-
controlled turns. You can increase the percentage to limit the
turn rate, and decrease the percentage to allow higher turn
rates.
Speed Source Settings
NOTE: Speed source settings are available only for power
boats.
To open the speed source settings, select
Menu > Setup >
Dealer Autopilot Configuration > Speed Source Setup .
Speed Source : Allows you to select the speed source.
Verify Tachometer : Allows you to compare the RPM readings
on the helm control with the tachometers on the dashboard
of your boat.
Planing RPM : Allows you to adjust the RPM reading on the
helm control at the point when your boat transitions from
displacement to planing speed. If the value does not match
the value on the helm control, you can adjust the value.
Planing Speed : Allows you to adjust the planing speed of your
boat. If the value does not match the value on the helm
control, you can adjust the value.
Low RPM Limit : Allows you to adjust the lowest RPM point of
your boat. If the value does not match the value on the helm
control, you can adjust the value.
High RPM Limit : Allows you to adjust the highest RPM point of
your boat. If the value does not match the value on the helm
control, you can adjust the value.
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