Appearance of
surface noise
Surface
noise
11.4TVG
[MENU] SOUNDER
TVG [ENT]
Off Manual [ENT]
1. Press key in screen.
2. Choose and then press key. The following window will appear.
3. Choose or as desired then press key." " " "
The TVG compensates for propagation loss of sound, so that the echoes from the
same fish school size are displayed in the same color. Normally, set it between
0 and 5 . Avoid excessive TVG; weak echoes may not be displayed. The TVG
is also useful for reducing surface noise.
" " " "
Note: Surface noise appearing in the range of 0 to 40 m can be reduced by the
Clutter function.
Fish school A
Fish school B
How TVG compensates for
propagation loss of sound
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