Calibrating The Compass; Creating A Waypoint On The Sonar Screen; Measuring Distance On The Sonar Screen; Pausing The Sonar Display - Garmin GPSMAP 8400 series Owner's Manual

Calibrating the Compass

Before you can calibrate the compass, the transducer must be
installed on the shaft far enough away from the trolling motor to
avoid magnetic interference, and deployed in the water.
Calibration must be of sufficient quality to enable the internal
compass.
NOTE: To use the compass, you must mount the transducer on
the shaft. The compass does not work when you mount the
transducer on the motor.
NOTE: Compass calibration is available only for transducers
with an internal compass.
You can begin turning your boat before calibrating, but you must
fully rotate your boat 1.5 times during calibration.
1
From a ForwardVü or LiveVü Forward sonar page, select
Menu > Sonar Setup > Installation.
2
If necessary, select Use AHRS.
3
Select Calibrate Compass.
4
Follow the on-screen instructions.

Creating a Waypoint on the Sonar Screen

1
From a sonar view, select .
2
Select a location.
3
Select New Wpt or .
4
If necessary, edit the waypoint information.

Measuring Distance on the Sonar Screen

You can measure the distance between two points on the
SideVü sonar view.
1
From the SideVü sonar view, select a location on the screen.
2
Select Measure Distance.
A push pin appears on the screen at the selected location.
3
Select another location.
The distance and angle from the pin is listed in the upper-left
corner.
TIP: To reset the pin and measure from the current location of
the pin, select Measure Distance.

Pausing the Sonar Display

From a sonar view, select .

Viewing Sonar History

You can scroll the sonar display to view historical sonar data.
NOTE: Not all transducers save historical sonar data.
1
From a sonar view, select .
2
Drag the screen.

Sonar Sharing

This feature may not be available on all chartplotter models.
You can view the sonar data from all compatible sources on the
Garmin Marine Network. You can view sonar data from a
compatible external sonar module, such as a GCV
module. In addition, you can view the sonar data from other
chartplotters that have a built-in sonar module.
Each chartplotter on the network can display sonar data from
every compatible sonar module and transducer on the network,
no matter where the chartplotters and transducers are mounted
on your boat. For example, from a transducer with DownVü
mounted at the back of the boat, you can view the sonar data
using the GPSMAP 8417 mounted at the front of your boat.
When sharing sonar data, the values of some sonar settings,
such as Range and Gain, are synchronized across the devices
on the network. The values of other sonar settings, such as the
Appearance settings, are not synchronized and should be
Sonar
configured on each individual device. In addition, the scroll rates
of the various traditional and DownVü sonar views are
synchronized to make the split views more cohesive.
NOTE: Using multiple transducers simultaneously can create
cross talk, which can be removed by adjusting the Interference
sonar setting.

Selecting a Sonar Source

This feature may not be available with all models.
When you are using more than one sonar data source for a
particular sonar view, you can select the source to use for that
sonar view. For example, if you have two sources for DownVü,
you can select the source to use from the DownVü sonar view.
1
Open the sonar view for which you will change the source.
2
Select Menu > Sonar Setup > Source.
3
Select the source for this sonar view.

Renaming a Sonar Source

You can rename a sonar source to easily identify that source.
For example, you use "Bow" as the name of the transducer on
the bow of your boat.
The source is renamed for the present view only. For example,
to rename the DownVü sonar source, you must open the
DownVü sonar view.
1
From the sonar view, select Menu > Sonar Setup > Source
> Rename Sources.
2
Enter the name.

Adjusting the Level of Detail

You can control the level of detail and noise shown on the sonar
screen either by adjusting the gain for traditional transducers or
by adjusting the brightness for DownVü transducers.
If you want to see the highest intensity signal returns on the
screen, you can lower the gain or brightness to remove lower
intensity returns and noise. If you want to see all return
information, you can increase the gain or brightness to see more
information on the screen. This also increases noise, and can
make it more difficult to recognize actual returns.
1
From a sonar view, select Menu.
2
Select Gain or Brightness.
3
Select an option:
• To increase or decrease the gain or brightness manually,
select Up or Down.
• To allow the chartplotter to adjust the gain or brightness
automatically, select an automatic option.

Adjusting the Color Intensity

You can adjust the intensity of colors and highlight areas of
interest on the sonar screen by adjusting the color gain for
traditional transducers or the contrast for DownVü and SideVü/
DownVü transducers. This setting works best after you have
adjusted the level of detail shown on the screen using the gain
or brightness settings.
If you want to highlight smaller fish targets or create a higher
™ sonar
intensity display of a target, you can increase the color gain or
contrast setting. This causes a loss in the differentiation of the
high intensity returns at the bottom. If you want to reduce the
intensity of the return, you can reduce the color gain or contrast.
1
From a sonar view, select Menu.
2
Select an option:
• While in the DownVü or SideVü sonar view, select
Contrast.
• While in a Panoptix LiveVü sonar view, select Color Gain.
• While in another sonar view, select Sonar Setup >
Advanced > Color Gain.
19