Raymarine DS400X, Owner'S Handbook Manual

Page: 46 / 92

36 DS400X and DS500X Digital Fishfinders
Your choices are:
•
AUTOMATIC:
Displays colors based on current conditions (with as many
colors as possible) while minimizing noise and clutter. As conditions
change the auto-color gain adjusts.
•
MANUAL
: Setting a low value produces a wide band for the weakest colors
but a small signal band for the other colors; setting a high value gives a
wide band for the strongest colors but a small signal band for the other col-
ors. If you select manual adjustment, you will need to re-adjust the gain as
conditions change.
The default setting is
AUTOMATIC
.
Time Variable Gain (TVG)
TVG (Time Variable Gain) reduces clutter by varying the gain throughout
the water column. This function is useful for reducing “noise” that can
appear. Increasing the TVG value increases the maximum depth to which
TVG is applied. Decreasing reduces the maximum depth.
Although you can manually set the TVG level, Raymarine recommends
letting the unit choose the proper level for you by selecting
AUTOMATIC
.
The default setting is
AUTOMATIC
.
Sounder Interference Rejection (Int. Rej.)
Two or more sonar-equipped vessels operating within range of each other
can interfere with sounder operation. This usually appears as vertical streaks
on the display that do not represent actual targets.
This option can reduce such interference, either manually or automatically.
•
AUTOMATIC
selects the best rejection level for you
•
LOW
minimizes rejection of potential interference. Use this setting when
you want to be sure that what has been removed are really false returns.
•
HIGH
rejects much more interference but can potentially weaken the
appearance of actual targets.
The default setting is
AUTOMATIC
.