use polar data to calculate optimal laylines and starting
line guidance.
Importing a Polar Table Manually
If you save the polar table file as polar.plr and place
it in the Garmin/polars/ folder on the memory card,
the chartplotter imports the data automatically after you
insert the memory card. If it does not import the data
automatically, or if you want to load a different set of data,
you can initiate the import manually.
1
Save the polar table file (polar.plr) to the Garmin/
polars/ folder on the memory card.
2
Insert the memory card containing the polar data file
into the chartplotter (
).
3
Select
Options
>
Settings
>
My Vessel
>
Polar Table
>
Import from Card
.
4
If necessary, select the card slot and the polar table
file.
Showing Polar Data in Data Fields
Before you can view polar data, you must import a
polar table from a memory card (
).
1
Open the screen to which you want to add polar data.
2
Select
Options
>
Edit Overlays
.
3
Select the data field to change.
4
Select
Sailing
.
5
Select the polar data to display in the data field.
• To show the boat speed from the polar table at
the current true wind speed and angle, select
Polar
Speed
.
• To show the optimal boat speed at the target wind
angle, select
Target Speed
.
• To show the optimal wind angle at the current true
wind speed, select
Target True Wind Angle
.
• To show Target TWA converted to apparent using
target speed, select
Target App. Wind Angle
.
• To show the difference between the current boat
speed and the optimal boat speed shown as speed,
select
Δ Polar Speed
.
• To show the difference between the current boat
speed and the optimal boat speed as a percentage,
select
Δ Polar Speed Percent
.
• To show the difference between the current boat
speed and the target boat speed shown as speed,
select
Δ Target Speed
.
• To show the difference between the current boat
speed and the target boat speed shown as a
percentage, select
Δ Target Speed Percent
.
• To show the difference between the true wind angle
and target true wind angle, select
Δ Target True
Wind Angle
.
• To show the difference between the apparent wind
angle and target apparent wind angle and the true
wind angle, select
Δ Target App. Wind Angle
.
TIP:
You can also use the polar table data when
calculating laylines and starting line guidance.
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.
1
Measure the distance:
• If 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. Enter this value as a positive number.
• If the transducer is installed at the bottom of the
keel
and you want to know the true depth of
the water, measure the distance from the transducer
to the water line. Enter this value in as a negative
number.
2
Complete an action:
• If the transducer is connected to the chartplotter or
a sonar module, select
Options
>
Settings
>
My
Vessel
>
Depth and Anchoring
>
Keel Offset
.
• If the transducer is connected to the NMEA
2000 network, select
Options
>
Settings
>
Communications
>
NMEA 2000 Setup
>
Device
List
, select the transducer, and select
Review
>
Keel Offset
.
3
Select
if the transducer is installed at the water line,
or select
if the transducer is installed at the bottom
of the keel.
4
Enter the distance measured in step 1.
Heading Line and Angle Markers
The heading line is an extension drawn on the map from
the bow of the boat in the direction of travel. Angle
markers indicate relative position from the heading or
course over ground, which are helpful for casting or
finding reference points.
Sailing Features
35
