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Garmin GHP 12 Autopilot System Manual

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GHP12InstallationInstructions 17
2. Center the rudder position, let go of the rudder control, and select
Begin.
A graph appears. The red line
➊
represents the intended position
of the rudder. The blue line
➋
represents the actual position of the
rudder.
➊
➋
3. Select Tune, and observe the graph.
• The intended rudder position (indicated by the red line) moves
from +5° to -5° each time you select Tune, and the drive unit
steers the rudder accordingly (indicated by the blue line).
• If the drive unit speed is congured too slowly, it will react
sluggishly. The blue line will draw a large slope
➊
to the red line
after you select Tune.
➊
• If the drive unit speed is congured too quickly, it will react
immediately and drive hard to the rudder stop. The blue line will
draw a hard straight line that hits the red line without a slope
➋
after you select Tune.
➋
• If the drive unit speed is congured correctly, it will react
quickly, then ease into the stop. The blue line will draw a straight
line with a small slope
➌
as it approaches the red line after you
select Tune.
➌
4. If necessary, select Adjust.
5. Select an option:
• Increase the value if the drive unit speed is congured too
slowly, and repeat step 3.
• Decrease the value if the drive unit speed is congured too
quickly, and repeat step 3.
6. When the drive-unit speed is tuned correctly, select Done.

The error tolerance of the drive unit determines how much error the
autopilot allows before adjusting the drive unit.
If you set the error tolerance too low, the drive unit will react to the
slightest course deviation. This causes the drive to work harder and may
drain your battery at a faster-than-normal speed.
If you set the error tolerance too high, the drive unit will not react until
your course is off a signicant distance. This causes a less reliable
heading hold, and can result in unnecessarily large course corrections.
1. From the Heading screen, select Menu > Setup > Dealer Autopilot
Conguration > Steering System Setup > Drive Unit Type >
Other > Advanced Tuning > Tune Error Tolerance.
2. Center the rudder position, let go of the rudder control, and select
Begin.
3. Select Tune.
The rudder position moves from +5° to -5° each time you select
Tune, and the drive unit steers and holds the rudder accordingly.
4. After the drive unit stops, observe the rudder error and power usage
elds for 30 seconds.
• If the power usage eld uctuates, then your error tolerance is
set too low.
• If the power usage eld stays at 0%, but the rudder error eld
shows and unacceptable degree of error (1% or more), then your
error tolerance is set too high.
TIP: An ideal error tolerance conguration holds the rudder at
an acceptable degree of error (.5% or so) without unnecessarily
adjusting the drive unit and wasting power (0% for 30 seconds
or more).
5. If necessary, select Adjust.
6. Select an option:
• Decrease the value if the error tolerance is too high, and repeat
steps 3–5.
• Increase the value if the error tolerance is set too low, and repeat
steps 3–5.
7. When the drive-unit error tolerance is tuned correctly, select Back.
… 17 …


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