Raymarine gS Series, Installation And Operation Instructions Manual, Page: 28 / 208

7.3 Sonar check
Sonar transducer and sonar module
selection
You must select the sonar transducer and Sonar module that
you want to use in the displayed Fishfinder application pane.
Sonar module selection
• Sonar and DownVision TM variant displays are fitted with an
internal sonar module.
• All variants allow you to connect a compatible external sonar
module or use an internal sonar module from a networked
display.
• The sonar channel you want to use must be selected from the
Fishfinder menu.
Transducer selection
• Sonar variant displays allow direct connection of a Raymarine
OR a Minn Kota sonar transducer.
• DownVision TM variant displays allow direct connection of
Raymarine DownVision TM transducers.
• All variants allow the connection of a Raymarine sonar
transducer via a compatible external sonar module.
• For all variants use the Transducer Set-Up menu in the
Fishfinder application to specify the transducer you want to
use.
Selecting the sonar channel
To select the channel you want to display follow the steps below.
From the Fishfinder application:
1. Select Menu .
2. Select Channel .
The Channel selection page is displayed.
3. Select the tab for the sonar module you want to use.
A list of available channels for the selected sonar module
is displayed.
4. Select a channel from the list.
The Channel selection page will close and the Fishfinder
application will now show the selected channel.
Selecting the sonar transducer
With the fishfinder application displayed:
1. Select Menu .
2. Select Set-Up .
3. Select Transducer Set-Up .
4. Select Transducer .
A list of transducers is displayed.
5. Select the transducer you want to use.
Selecting the speed transducer
With the fishfinder application displayed:
1. Select Menu .
2. Select Set-Up .
3. Select Transducer Set-Up .
4. Select Speed Transducer .
A list of transducers is displayed.
5. Select your speed transducer from the list.
Checking the sonar
Sonar checks are made using the fishfinder application.
1. Select a fishfinder page from the Homescreen.
2. Check the fishfinder display.
With the fishfinder active you should see:
• Depth reading (indicates the transducer is working). The
depth is shown in a databox in the bottom left of the screen.
If the databox is not present it can be turned on from the
Presentation menu:
Menu > Presentation > Databoxes
Set-up .
Fishfinder Transducer Calibration
Your fishfinder transducer must be calibrated correctly to achieve
accurate depth readings.
The multifunction display receives the image from a sonar
module which processes sonar signals from a transducer
mounted in the water. If the transducer is equipped with a speed
paddle wheel and temperature-sensing thermistor, the sonar
module calculates speed and temperature. To ensure accurate
readings, it may be necessary to calibrate the transducer(s)
by applying offsets to depth, speed and temperature. As
these settings are held in the sonar module and relate to the
transducer, they are applied system-wide.
Depth Offset
Depths are measured from the transducer to the sea bed, but
you can apply an offset value to the depth data, so that the
displayed depth reading represents the depth to the sea bed
from either the keel or the waterline.
Before attempting to set a waterline or keel offset, find out
the vertical separation between the transducer and either
the waterline or the bottom of the keel on your vessel, as
appropriate. Then set the appropriate depth offset value.
D9343--2
1 2 3
1 Waterline offset
2 Transducer / Zero offset
3
Keel offset
If an offset is not applied, displayed depth readings represent the
distance from the transducer to the sea bed.
Setting the depth offset
From the fishfinder application:
1. Select
Menu .
2. Select Set-up .
3. Select Transducer Set-up .
4. Select Depth Offset .
The depth offset numeric adjust control is displayed.
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gS Series