Applying Proper Tvg - Furuno CH-37 Operator's Manual

Furuno color sector scanning sonar operator's manual model ch-37

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3.8 Applying Proper TVG

Level too low

Function

Trackball

Trackball data

Data

1) Position the trackball marker on the desired location.

2) Read the trackball data displayed at the upper left corner

of the screen.

The TVG function is the same as the one explained in the so-

nar mode. For best results, set both TVG level and time a little

lower than the ones in the sonar mode. The setting is mode on

the BOTTOM/3D menu screen and the usual setting for both

time and level is 3.

TVG LEVEL

TVG TIME

BEAM WIDTH

Figure 3-7 Bottom/3D menu screen

TVG level rejects surface noise, which may mask shallow tar-

gets and TVG time adjusts the effective depth.

Proper

Figure 3-8 Examples of proper and improper TVG

Procedure/Purpose

Trackball marker

: SONAR

BOTTOM/3D

3.0

NAR

Level too high

Horizontal Range

Depth

DUAL

E/S

Time to high

3-7

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