4.Press 
or 
to adjust TVG distance, considering sea conditions. The larger the figure the greater the distance at which the TVG works.
TVG |
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| . . . . | 10.0 |
Distance | 0 | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 | ||
Setting |
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|
Meters | 3 | 8 | 20 | 40 | 60 | 100 | 130 | 160 | 200 | 250 | 320 | . . . . | 1000 |
Feet | 10 | 30 | 70 | 130 | 210 | 330 | 410 | 520 | 660 | 820 | 1040 |
| 3280 |
Passi/braza | 2 | 5 | 10 | 20 | 40 | 60 | 80 | 100 | 120 | 150 | 180 |
| 600 |
Hiro | 2 | 5 | 10 | 20 | 40 | 60 | 80 | 100 | 130 | 170 | 210 | . . . . | 660 |
5.Press 
or 
to close the dialog box and return to the VERT menu.
6.To suppress reflections by the sea surface or plankton, select TVG LEVEL and press 
.
7.Press 
or 
to adjust TVG LEVEL, considering sea conditions. The larger the figure the less the gain over distance.
8.Press the [MENU] key to register your selection and close the menu.
Wrong | Correct | Level too high | Distance too high |
Figure 3-14 Examples of proper and improper TVG
3.11.2 Suppressing noise and interference
You may encounter occasional or intermittent noise and interference as shown below. This is mostly caused by electrical equipment, engine, propeller noise from own ship, or noise from other sonars being operated nearby. If interference appears, turn on the interference rejector in the COM1 menu to suppress it.
Interference rejector ON
Interference (In this display, interference shows itself every 6˚.)