12
GHP 20 Installation Instructions
about the Sea trial Wizard
The Sea Trial Wizard configures the fundamental sensors on the
autopilot, and it is extremely important to complete the wizard in
conditions appropriate for your boat.
Important Sea trial Wizard Considerations
Complete the Sea Trial Wizard in calm water. The nature of calm water
is relative to the size and shape of your boat.
• Ensure your boat does not rock while sitting still or moving very
slowly.
• Ensure your boat is not significantly affected by the wind.
•
Keep the weight on your boat balanced. DO NOT move around
on the boat while completing any of the steps in the Sea Trial
Wizard
.
Starting the Sea trial Wizard
Before you start the Sea Trial Wizard, you must drive to an open area of
calm water.
1. Turn on the GHP 20.
2. Select an option:
• If the Sea Trial Wizard starts automatically, proceed to step 3.
• If the Sea Trial Wizard does not start automatically, select
Menu
>
Setup
>
Dealer Autopilot Configuration
>
Wizards
>
Sea
Trial Wizard
.
3. Select
Begin
.
Performing the Sea trial Wizard
1. Drive your boat to an open area of calm water.
2. Start the Sea Trial Wizard (
).
3. Configure the planing RPM (
).
5. Perform the autotune procedure (
).
6. Set north (
7. If necessary, set the fine heading adjustment (
).
Configuring the Planing RPM
1. Note the RPM reading from the tachometer on the dashboard of
your boat at the point your boat transitions from displacement to
planing speed.
2. If the tachometer value does not match the value on the GHC 10,
use the arrows to adjust the value.
3. Select
Done
.
Calibrating the Compass
1. Drive your boat at slow/idle speed in a straight line.
2. Select
Begin
, and continue to drive in a straight line.
3. When instructed, turn the boat slowly clockwise, taking care to
make the turn
as steady and flat
as possible.
Turn slowly so that the boat DOES NOT list
.
The GHC 10 displays a completion message when the calibration is
complete.
4. Select an option:
• If the calibration completes successfully, select
Done
.
• If the calibration fails, select
Retry
and repeat steps 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, select
Done
and take
manual control of the boat.
• If the autotune failed, adjust the throttle and select
Retry
Autotune
.
4. If autotune fails, repeat steps 1–3 until the autotune completes
successfully.
5. If the autotune procedure continues to fail after you reach maximum
cruising speed, reduce your speed to the initial autotune speed
and select
Alternate Autotune
to begin an alternate autotuning
procedure.
Setting north
Before you can set north, you must have at least 45 seconds of hazard-
free, open water available.
This procedure appears only if you connect an optional GPS device to
the GHP 20 (
), and the device has acquired a GPS position. If
you do not have a GPS device connected, you are prompted to set the
).
1. Drive the boat in a straight line at cruising speed, parallel to the
prevailing wind and current, for 45 seconds.
2. Select
Begin
.
3. Select an option:
• If the calibration completed successfully, select
Done
.
• If the calibration failed, repeat steps 1–2.
Setting the Fine Heading adjustment
This procedure appears only if you do not have an optional GPS
device connected to the GHP 20 (
device installed on your boat that has acquired a GPS position, you are
prompted to set north instead (
).
1. Using a handheld compass, identify north.
2. Adjust the fine heading setting until it matches north on the
magnetic compass.
3. Select
Done
.
Evaluating the Results of the autopilot Configuration
1. Test the autopilot at a slow speed.
2. If necessary, adjust the gain setting (
3. Test the autopilot at a higher speed (normal operating conditions).
4. If necessary, adjust the gain and acceleration limiter settings.
testing and adjusting the autopilot Configuration
1. Drive the boat in one direction with the autopilot engaged (heading
hold).
The boat should not oscillate significantly; however, a small amount
of oscillation is normal.
Summary of Contents for GHP 20
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