Raymarine A65, Operation Instructions Manual, Page: 221 / 390

15.18 Sensitivity settings
The Sensitivity settings menu provides access to
features that enhance what is displayed onscreen. In
most situations default values should be adequate.
Legacy, traditional and CHIRP sonar modules
CPx70
external
CHIRP
external
Tradi-
tional
external Tradi-
tional
internal Legacy
external
Manual
/ Auto
Gain
Auto
Gain
Modes
Auto
Gain
Offset
Manual
/ Auto
Inten-
sity
Auto
Inten-
sity
Offset
Color
Gain
TVG
Auto
TVG
Modes
Depth
Sensi-
tivity
Color
Thres-
hold
Power
Mode
DownVision TM and SideVision TM sonar modules
DownVision TM
SideVision TM
Gain
Contrast
Noise Filter
Color Threshold
Gain
The gain settings alter the way the sonar module
processes background noise. Adjusting the gain
settings can improve the sonar image, however
for optimum performance in most conditions, we
recommend that you use the auto settings.
The gain control determines the strength above
which echoes are displayed onscreen.
20% Manual Gain Auto Gain 80% Manual Gain
Auto
In Auto mode the sonar module automatically adjusts
the gain setting to suit current conditions.
Auto Gain modes
When connected to a Legacy sonar module or a
Traditional internal sonar module 3 Auto Gain modes
are available:
• Cruising (Low)
• Trolling (Med)
• Fishing (Fast)
Auto Gain Offset
When connected to a CPx70 series sonar module
Auto Gain can be offset by +/–50%. This allows
small modification to be made to the gain, while
still utilizing Raymarine’s proprietary noise filter and
target identification algorithms.
Manual
If necessary you can set the gain controls manually,
between a value of 0% to 100%. This value should
be set high enough to see fish and bottom detail but
without too much background noise. Generally a
high gain is used in deep and/or clear water; a low
gain in shallow and/or murky water.
The new values remain set even when you switch
off the display.
Onscreen gain control
Selecting the onscreen control enables you to adjust
the setting as required.
When connected to a CPx70
series sonar module the Auto
gain can be offset by +/-50%
When connected to non
CPx70 series external
CHIRP , external Traditional
or DownVision TM sonar
modules gain modes are not
required.
Fishfinder application
221