What Gain Modes Are Available - Raymarine C-Series Reference Manual

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What gain modes are available?

GAIN MODE
AUTO
The Fishfinder automatically adjusts the gain controls, based on depth and water
conditions, and displays the sharpest possible image. Raymarine recommends that
you retain this AUTO setting to achieve the the best results.
In addition to the controls described in this section, the Fishfinder Setup options
Note:
allow you to adjust the Interference Rejection, 2nd Echo Interference Rejection and
Ping Rate Limit. These options are described in DSM Setupon page 23.
Auto Gain
The gain, or sensitivity, of the display adjusts background noise by varying the echo
strength for display. The value of the GAIN control determines the strength above
which echoes are displayed. There are three AUTO GAIN modes:
• Low is ideal for viewing fishfinder images with a minimum of background noise as
you are cruising to your fishing spot. Only the strongest echoes are displayed.
• Medium is a slightly higher gain setting that displays more detailed echoes as you
are trolling. This is the default mode.
• High gives the best details of the targets you have located but also displays the
most background noise and surface clutter. This is suitable when you are fishing.
With all of these modes, the DSM will automatically adjust the Gain setting for current
conditions and adjust separately for each frequency. Any adjustments made apply to
all windows using that frequency.
Color Gain
Color gain determines how echoes of different strengths are displayed. As conditions
change the color gain adjusts accordingly.
TVG (Time Varied Gain)
The TVG (Time Variable Gain) reduces the clutter by varying the gain throughout the
water column This function is useful for reducing the appearance of 'noise'. Increasing
the TVG value increases the maximum depth to which TVG is applied. Decreasing it
reduces the maximum depth. TVG has no effect in Fishfinder Simulator Mode.
AUTO GAIN
MAN LO MED HI
C-Series Display Reference Manual
COLOR GAIN TVG
AUTO MAN AUTO MAN