Garmin echoMAP CHIRP 73cv Owner's Manual

Select Engage Port or Engage Starboard.

You can use the circles pattern to steer the boat in a continuous 

circle, in a specified direction, and at a specified time interval.

From the autopilot screen, select MENU > Pattern Steering 

> Circles.

If necessary, select Time, and select a time for the autopilot 

to steer one complete circle.

Select Engage Port or Engage Starboard.

You can use the zigzag pattern to steer the boat from port to 

starboard and back, over a specified time and angle, across 

your present heading.

From the autopilot screen, select MENU > Pattern Steering 

> Zigzag.

If necessary, select Amplitude, and select a degree.

If necessary, select Period, and select a length of time.

Select Engage Zigzag.

You can use the Williamson turn pattern to steer the boat 

around with the intent of running alongside the location where 

the Williamson turn pattern was initiated. The Williamson turn 

pattern can be used in man overboard situations.

From the autopilot screen, select MENU > Pattern Steering 

> Williamson Turn.

Select Engage Port or Engage Starboard.

You can select your boat type to configure the chartplotter 

settings and to use features customized for your boat type.

Select Settings > My Vessel > Vessel Type.

Select an option.

You can use the device to increase the likelihood that your boat 

will cross the start line of a race exactly when the race begins. 

When you synchronize the race timer with the official race 

countdown timer, you are alerted at one-minute intervals as the 

race start approaches. When you combine the race timer with 

the virtual start line, the device measures your speed, bearing, 

and remaining time on the countdown timer. The device uses 

this data to indicate whether your boat will cross the start line 

before, after, or at the correct time to start the race.

Sailing start line guidance is a visual representation of the 

information you need to cross the start line at the optimal time 

and speed.
After you set the starboard and port start line pins, and the 

target speed and time, and after you start the race timer, a 

predictor line appears. The predictor line extends from your 

current location toward the start line and the laylines that extend 

from each pin.
The end point and color of the predictor line indicate where the 

boat will be when the timer expires, based on your current boat 

speed.
When the end point is before the start line, the line is white. This 

indicates the boat must increase speed to reach the start line on 

time.

When the end point is past the start line, the line is red. This 

indicates the boat must reduce speed to avoid a penalty for 

reaching the start line before the timer expires.
When the end point is on the start line, the line is white. This 

indicates the boat is moving at an optimal speed to reach the 

start line when the timer expires.
By default, the start line guidance window and the race timer 

window appear in the Sail Racing combination screen.

From the starting line guidance gauge, select MENU > Start 

Line.

Select an option:
• To mark the port and starboard starting line marks as you 

sail past them, select Ping Marks.

• To mark the port and starboard starting line marks by 

entering their coordinates, select Enter Coordinates.

• To switch the position of the port and starboard marks 

after you have set them, select Swap Port & Starbd. 

Marks.

You can use the starting line guidance feature to help get you 

cross the start line, at the optimal speed during a sailing race.

Mark the starting line (

).

From the Start Line Guidance gauge, select MENU > Target 

Speed, and select your target speed when crossing the 

starting line.

Select Target Time, and select the target time to cross the 

starting line.

Select BACK.

Start the racing timer (

).

From the starting line guidance gauge, select   or   to set 

the timer.

Select SELECT to start and stop the timer.

You can enter the distance between the bow of your boat and 

the location of your GPS antenna. This helps ensure the bow of 

your boat crosses the starting line at the precise start time.

From the starting line guidance gauge, select MENU > Start 

Line > GPS Bow Offset.

Enter the distance.

Select SELECT.

To use the laylines features, you must connect a wind sensor to 

the chartplotter.
When in sailing mode (

), you 

can display laylines on the navigation chart. Laylines can be 

very helpful when racing.
From the navigation chart, select MENU > Laylines.
Display: Sets how the laylines and vessel appear on the chart, 

and sets the length of the laylines.

Sailing Ang.: Allows you to select how the device calculates 

laylines. The Actual option calculates the laylines using the 

measured wind angle from the wind sensor. The Manual 

option calculates the laylines using manually entered 

windward and leeward angles.

Tide Correction: Corrects the laylines based on the tide.
Filter Time Constant: Filters the layline data based on the time 

interval entered. For a smoother layline that filters out some 

of the changes in the boat's heading or true wind angle, enter 

Sailing Features

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