Manual Garmin GHC 20 (page 4 of 8) (English)

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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 (page 2).

Select Menu > Steering Mode.

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

Select Menu > Steering Mode > Step Turn Size.

Select or .

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

Select Menu > Setup > User Autopilot Setup > Direction

Control.

Select Enabled.

Using Direction Control

Before you can use direction control, you must enable the

direction control functionality (page 2).

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.

Select Menu > Pattern Steering > Zigzag > Setup > Zigzag

Amplitude.

Select or to set the amplitude in increments of 5°.

Select Done.

Select Setup > Zigzag Period.

Select or to set the period.

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

Select Menu > Pattern Steering > Circles > Time.

Select or to set the time.

Select Done.

Following the Circles Pattern

Select Menu > Pattern Steering > Circles > Engage.

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

Select Menu > Pattern Steering > U-Turn > Engage.

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.

Select Menu > Pattern Steering > Williamson Turn >

Engage.

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

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Garmin GHC 20 Manual

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