1. OPERATION
11
3.
Use
S
or
T
to select Clutter and press
the
ENTER
key.
4.
Use
S
or
T
to select HF Clutter or LF
Clutter as applicable and press the
EN-
TER
key.
5.
Use
S
or
T
to set clutter level and press
the [ENTER] key. The setting range is 0-
100(%), in intervals of 10(%). The larger
the setting, the greater the degree of clut-
ter rejection.
6.
Use
S
or
T
to select HF Curve or LF
Curve as applicable and press the
EN-
TER
key. The setting box shown below
appears.
Std:
Strong color echoes are displayed
as is and weak color echoes are shown
smaller, when the clutter level setting is
raised.
Linear:
All echoes are displayed smaller,
when the clutter level setting is raised.
H:
Show individual fish.
L:
Show small targets such as plankton.
S:
Display large individual fish located be-
tween the surface and midwater.
Custom:
Emphasize strong-to-medium
strength echoes. See User Clutter on
page 29.
7.
Use
S
or
T
to select setting desired and
press the
ENTER
key.
8.
Press the
MENU/ESC
key several times
to close the window.
1.14
Adjusting TVG
A fish school at a deep depth is displayed in
weak colors even if it is equal in strength to
one in shallow waters. This is due to propaga-
tion attenuation of the ultrasonic wave. To
compensate for this difference, use TVG.
TVG automatically adjusts the gain with depth
so that echoes of the same strength and dif-
ferent depths are shown in the same colors
regardless of their depths. The gain is in-
creased with depth to display echoes of equal
strengths in the same colors. In the figure be-
low, for example, the TVG is set for 100 m and
the TVG level is adjusted. Then, unwanted
echoes at a distance less than 100 m are de-
leted and echoes at depths greater than 100
m are not affected.
1.
Press the
MENU/ESC
key to open the
menu.
2.
Use
S
or
T
to select Sounder and press
the
ENTER
key.
IMPORTANT
Do not set the TVG too high; close-range
echoes may not be displayed. Carefully
adjust the TVG while observing the display.
0 m
100
0 m
100
Unwanted
echoes appear.
Unwanted
echoes suppressed.
TVG OFF:
Fish schools of
equal strengths
shown in different
sizes and colors.
TVG adjusted:
Fish schools of
equal strengths
shown in same
sizes and colors.
