Garmin GHP 20 System for Yamaha Helm Master Owner's Manual | Page 4

Garmin Autopilots Owner's Manual - GHP 20 System for Yamaha Helm Master.
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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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