Operation Manual

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Chapter 6: Fishfinder application 81

TVG (Time Varied Gain)

The TVG (Time Varied Gain) reduces clutter by varying the gain

throughout the water column. This function is useful for reducing the

appearance of ‘noise’.

Increasing the TVG value increases the maximum depth to which

TVG is applied; decreasing it reduces the maximum depth. A low

TVG value has little effect on gain in shallow water; a high value

decreases the gain in shallow water so that only the strongest ech-

oes are displayed.

Power setting

The power setting controls the power level of the transducer.

To adjust power settings:

1. Press the PRESENTATION softkey.

2. Select from the appropriate POWER options on the toolbar.

3. In manual mode, use the trackpad to choose the power setting

you want to use.

4. Press OK.

Power settings:

• Auto

This is the default setting. When it is selected the DSM automat-

ically determines the required power setting based on the

current depth, speed, and (bottom) signal strength.

• Manual

If you wish to manually adjust the power to suit current condi-

tions, you can adjust the power level between 0% and 100%, in

10% increments. Lower

power levels are normally used in depth

ranges less than 8 ft. (2.4 m) and higher

power levels are typi-

cally selected for depths greater than 12 ft. (3.7 m).

Dual / Single frequency view

Dual frequency operation allows the sonar to operate and display 2

frequencies simultaneously.

If the preset you are using has two frequencies, you can view either

one or both of those frequencies in separate windows.

To set frequency views

1. Press the PRESENTATION softkey.

2. Toggle to F1, F2 or BOTH on the VIEW softkey.

3. Press OK.

To configure your transducer for dual frequency

1. With a fishfinder window active, press and hold the PAGE/MENU

button.

2. Select Configure Frequency Presets.

3. Use the trackpad to assign the required preset frequencies

Note: The DUAL preset has dual frequency values as a default

setting.

See Configure Preset Frequency settings on page 85 for more infor-

mation on assigning frequencies.