1. OPERATION
1-25
• [Linear]: All echoes are displayed smaller, when the clutter level setting is
raised.
6. Select [HF Clutter] or [LF Clutter] as applicable, then push the ENTER knob.
7. Select the clutter level, then push the ENTER knob.
The larger the setting, the greater the degree of clutter rejection.
8. Press the MENU/ESC key several times to close the menu.
1.20 Adjusting TVG
A school of fish 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 propagation attenuation of the ultra-
sonic wave. To compensate for this difference, use TVG. TVG automatically adjusts
the gain with depth so that echoes of the same strength and different depths are
shown in the same colors regardless of their depths. The gain is increased with depth
to display echoes of equal strengths in the same colors. In the figure below, for exam-
ple, the TVG is set for 100 m and the TVG level is adjusted. Then, unwanted echoes
at a distance less than 100 m are deleted and echoes at depths greater than 100 m
are not affected.
1. Press the MENU/ESC key, then open the [Setting], [External fish finder] or [Tele-
sounder] tab.
2. Select [Sounder], then push the ENTER knob.
3. Select [TVG], then push the ENTER knob.
For [Setting] and [Telesounder] tab, go to next step. For [External fish finder] tab,
go to step 6.
4. Select [HF TVG Distance] or [LF TVG Distance] as applicable,
then push the ENTER knob.
5. Select a suitable value, then push the ENTER knob.
0 m
100 m
0 m
100 m
TVG OFF:
Schools of fish of
equal strengths
shown in different
sizes and colors.
TVG adjusted:
Schools of fish of
equal strengths
shown in same
sizes and colors.
Unwanted echoes appear.
Unwanted echoes suppressed.
For [Setting] and [Telesounder] tab For [External fish finder] tab
TVG
HF TVG Level
HF TVG Distance
LF TVF Level
LF TVG Distance
3
600ft
3
600ft
TVG
HF TVG Level
LF TVF Level
5
5
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