Raymarine a67 Wi-Fi Installation And Operation Instructions Manual page 195

4. Adjust the gain control to the required setting, or
5. Select Auto.
A tick is displayed in the Auto box to signify automatic gain
is enabled.
Setting the auto gain mode for non-CHIRP sonar modules
When using a non-CHIRP sonar module, from the fishfinder
application:
1. Select Menu.
2. Select Sensitivity Settings.
3. Select Gain Mode.
A list of available auto gain modes is displayed:
• Cruising (Low)
• Trolling (Med)
• Fishing (High)
4. Select the required auto gain mode.
Fishfinder gain on-screen controls
Touchscreen multifunction displays provide on-screen access to
the gain controls.
Selecting the on-screen gain control will display the gain settings:
When connected to a non-CHIRP sonar module the automatic
gain has 3 modes:
When connected to a CHIRP sonar module no automatic gain
modes are required:
When in manual mode the slider bar control is shown:
Note: New c Series gain controls are accessed by the menu
options: Menu > Sensitivity Settings > Gain.
Enabling and disabling on-screen gain controls
You can enable and disable the on-screen gain controls by
following the steps below.
On a touchscreen multifunction display, with the relevant
application displayed.
1. Select Menu.
2. Select Presentation.
3. Select Gain Controls.
Select Gain Controls will switch between showing and hiding
the on-screen controls.
Adjusting fishfinder gain manually using on-screen
controls
Touchscreen multifunction displays provide on-screen access to
the gain controls.
1. Select the on-screen Gain control located on the left hand
side of the fishfinder application.
2. Select the Auto box to switch between Auto and Manual gain.
3. With Auto deselected, select and hold the Slider and move
Left to decrease value or Right to increase value.
Fishfinder application
Setting auto gain using the on-screen controls
Touchscreen multifunction displays provide on-screen access to
the gain controls.
1. Select the on-screen Gain control located on the left hand
side of the fishfinder application.
2. Select the Auto box to select Auto gain mode.
3. When connected to a non-CHIRP sonar module you can
select the Auto gain mode:
• Cruising
• Trolling
• Fishing
Fishfinder color gain
You can adjust the color gain to change the signal strength
threshold for the strongest color in your fishfinder display.
Color gain sets the lower limit for the strongest echo color. All
echoes with a signal strength above this value are displayed
in the strongest color. Those with a weaker value are divided
equally between the remaining colors.
• Setting a low value produces wide band for the weakest color,
but a small signal band for the other colors.
• Setting a high value gives a wide band for the strongest color,
but a small signal band for the other colors.
There are two color gain modes:
• Auto — In Auto mode the color gain setting is automatically
adjusted to suit current conditions. Any adjustments made
apply to all fishfinder windows.
• Manual — You can set the color gain manually, between a
value of 0% to 100%.
Adjusting the fishfinder color gain
From the fishfinder application:
1. Select Menu.
2. Select Sensitivity settings.
3. Select Color Gain.
The color gain slider bar control is displayed.
4. Adjust the control to the required value.
5. Select Back to confirm setting and close slider bar, or
6. Select Auto to enable automatic color gain.
The new values remain set even when you switch off the display
and are applied to all fishfinder windows.
Fishfinder TVG (Time Varied Gain)
The Time Varied Gain (TVG) function reduces the amount of
clutter in the fishfinder display by varying the gain throughout
the column of water. This function is useful for reducing the
appearance of 'noise'.
The operation of the TVG settings is dependant upon the
connected sonar module.
Non-CHIRP sonar modules
• Increasing the TVG value increases the maximum depth to
which TVG is applied. A high value decreases the gain in
shallow water so that only the strongest echoes are displayed.
• Decreasing the TVG value reduces the maximum depth. A
low TVG value has little effect on gain in shallow water.
TVG adjustment can be made automatically or manually.
CHIRP sonar modules
• A high value increases the gain in shallow water so that more
targets are displayed.
• A low value reduces the gain in shallow water so that less
clutter is displayed
TVG adjustment can be made automatically or manually.
TVG Presets and auto settings
When connected to a Raymarine CHIRP sonar module 3 preset
TVG options are available:
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