Selecting the steering mode, Adjusting the heading with the keys, Adjusting the step steering increment – Garmin GHC 20 User Manual
Page 4: Direction control, Enabling direction control, Using direction control, Steering patterns, Zigzag pattern, Setting up the zigzag pattern, Following a zigzag pattern
With the autopilot engaged, manually steer the boat.
The autopilot activates Shadow Drive mode.
When you release the helm and manually maintain a specific
heading for a few seconds, the autopilot resumes a heading
hold at the new heading. The heading trend indicator
appears, and the autopilot status indicator turns green to
indicate the autopilot has control of the boat.
Selecting the Steering Mode
Rudder steering mode turns the boat in 1° increments when you
select a key. Hold a key to turn the boat in a rate-controlled turn.
The boat continues to turn until you let go of the key.
Step steering mode turns the boat in increments of 10°. You can
customize step turn size increments (
).
1
Select Menu > Steering Mode.
2
Select Steering Mode to toggle between rudder steering
mode and step steering mode.
Adjusting the Heading with the Keys
Before you can steer your boat using the keys at the bottom of
the helm control, you must have the autopilot engaged.
• Select
or
to use rudder steering mode.
NOTE: Rudder steering mode is for use only on power
planing hull or power displacement hull boats.
• Hold 1°> 10°>> or <<10° <1° to use step steering mode.
Adjusting the Step Steering Increment
1
Select Menu > Steering Mode > Step Turn Size.
2
Select or .
3
Select Done.
Direction Control
Direction control informs the autopilot which direction the boat is
moving (forward or reverse) using the helm control.
Enabling Direction Control
1
Select Menu > Setup > User Autopilot Setup > Direction
Control.
2
Select Enabled.
Using Direction Control
Before you can use direction control, you must enable the
direction control functionality (
).
When traveling in standby mode, select Direction.
appears in the upper-right corner.
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.
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
Select Menu > Pattern Steering > Zigzag > Engage.
Circles Pattern
The circles pattern steers the boat in a continuous circle, in a
specified direction, and at a specified time interval.
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.
CAUTION
The boat must be below planing speed when using this pattern.
1
Select Menu > Pattern Steering > Williamson Turn >
Engage.
2
Select an option:
• Select
to begin a starboard turn.
• Select
to begin a port turn.
Cancelling a Steering Pattern
• Physically steer the boat.
NOTE: Shadow Drive must be enabled to cancel a steering
pattern by physically steering the boat.
• Select
or
to cancel a pattern using rudder steering
mode.
• Select <<10° <1° or 1°> 10°>> to cancel a pattern using step
steering mode.
• Select STBY.
2
Powerboat Autopilot Operation