Garmin GPSMAP A12, Owner'S Manual

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this data to indicate whether your boat will cross the start line
before, after, or at the correct time to start the race.
Starting Line Guidance
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.
Setting the Starting Line
The start line guidance window is added to the Sail Racing
combination screen by default.
1
From the Sail Racing combination screen, select Menu >
Start Line Guidance > Start Line .
2
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. .
Using the Starting Line Guidance
You can use the starting line guidance feature to help get you
cross the start line, at the optimal speed during a sailing race.
1
Mark the starting line ( Setting the Starting Line , page 21 ).
2
From the Sail Racing combination screen, select Menu >
Start Line Guidance > Target Speed , and select your target
speed when crossing the starting line.
3
Select Target Time , and select the target time to cross the
starting line.
4
Select Back .
5
Start the racing timer ( Starting the Race Timer , page 21 ).
Starting the Race Timer
The race timer is added to the Sail Racing combination screen
by default.
1
From the Sail Racing combination screen, select Start .
NOTE: You can also access this from the Sailing SmartMode
screen and the navigation chart.
2
When necessary, select Sync to synchronize with the official
race timer.
Stopping the Race Timer
From the Sail Racing combination screen, select Stop .
Setting the Distance between the Bow and the GPS
Antenna
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.
1
From a navigation chart, select Menu > Sailing > Start Line
> GPS Bow Offset .
2
Enter the distance.
3
Select Done .
Laylines Settings
To use the laylines features, you must connect a wind sensor to
the chartplotter.
When in sailing mode
Setting the Vessel Type , page 4 , you can
display laylines on the navigation chart. Laylines can be very
helpful when racing.
From the navigation chart, select Menu > Layers > My Vessel >
Laylines > Setup .
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.
Windward Ang. : Allows you to set a layline based on the
windward sailing angle.
Leeward Ang. : Allows you to set a layline based on the leeward
sailing angle.
Tide Correction : Corrects the laylines based on the tide.
Layline Filter : 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 a
higher number. For laylines that display a higher sensitivity to
changes in the boat's heading or true wind angle, enter a
lower number.
Setting the Keel Offset
You can enter a keel offset to compensate the water depth
reading for the transducer installation location. This allows you
to view the depth of the water below the keel or the true depth of
the water, depending on your needs.
If you want to know the water depth below the keel or the lowest
point of your boat and the transducer is installed at the water
line or anywhere above the end of the keel, measure the
distance from the transducer location to the keel of the boat.
If you want to know the true water depth and the transducer is
installed below the water line, measure the distance from the
bottom of the transducer up to the water line.
NOTE: This option is only available when you have valid depth
data.
Sailing Features 21