Steering Patterns - Garmin GHC 20 Owner's Manual

Steering Patterns

WARNING
You are responsible for the safe operation of your boat. Do not begin a pattern
until you are certain that the water is clear of obstacles.
The autopilot can steer the boat in preset patterns for fishing, and it can also
perform other specialty maneuvers such as U-turns and Williamson turns. You
can use the autopilot to begin pattern steering.
Pattern steering is not based on GPS, and it can be used without a GPS device
connected to the autopilot.
Zigzag Pattern
The zigzag pattern steers the boat from port to starboard and back, over a
specified time and angle, across your current heading.
Setting Up the Zigzag Pattern
You can modify the amplitude and period of the zigzag pattern. The default
values are 30° and 1.5 minutes.
1
Select Menu > Pattern Steering > Zigzag > Setup > Zigzag Amplitude.
2
Select or to set the amplitude in increments of 5°.
3
Select Done.
4 Select Setup > Zigzag Period.
5
Select or to set the period.
6
Select Done.
Following a Zigzag Pattern
1
Select Menu > Pattern Steering > Zigzag.
2
Select Engage.
Circles Pattern
The circles pattern steers the boat in a continuous circle, in a specified direction,
and at a specified time interval.
Powerboat Autopilot Operation
Setting Up the Circles Pattern
1
Select Menu > Pattern Steering > Circles > Time.
2
Select or to set the time.
3
Select Done.
Following the Circles Pattern
1
Select Menu > Pattern Steering > Circles > Engage..
2
Select an option:
• Select to begin a clockwise turn.
• Select to begin a counter-clockwise turn.
U-Turn Pattern
The u-turn pattern turns the boat around 180° and maintains the new heading.
There are no settings to adjust the u-turn pattern.
Following the U-Turn Pattern
1
Select Menu > Pattern Steering > U-Turn > Engage.
2
Select an option:
• Select to begin a starboard turn.
• Select to begin a port turn.
Williamson Turn
The Williamson turn pattern turns the boat around with the intent of running
alongside the location where the Williamson turn pattern was initiated. There are
no settings to adjust the Williamson turn pattern.
The Williamson turn pattern can be used in man overboard situations.
Following the Williamson Turn Pattern
WARNING
The Williamson turn pattern is not determined by GPS and is affected by wind,
current, and speed. Be ready to adjust the throttle and take the helm to avoid
harm to a person in the water.
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