Adjusting The Gain On The Sonar Screen; Selecting Frequencies - Garmin GPSMAP 190-01120-00 Owner's Manual

Sonar
Setting the Color Scheme
You can set the color scheme for all sonar screens.
1. From the Home screen, select
2. Complete an action:
Color Scheme
• Select
• Select Color Scheme

Adjusting the Gain on the Sonar Screen

You can control the sensitivity of the sonar receiver. To see more detail, increase the gain. If the
screen is cluttered, decrease the gain.
1. From the Home screen, select Sonar.
2. Select a sonar view.
Menu > Gain.
3. Select
4. Complete an action:
• Select Auto to allow the chartplotter to adjust the gain automatically.
Up Down
• Select or
5. Select Done.
Adjusting the Noise Rejection on the Sonar Screen
The Noise Rejection setting appears only when you have manually increased or decreased the gain
setting (page 104).
You can minimize the appearance of weak sonar returns by increasing the noise rejection.
1. From the Home screen, select Sonar.
2. Select a sonar view.
3. Select Menu > Noise
Up or Down.
4. Select

Selecting Frequencies

You can indicate which frequencies appear on the sonar screen when using a dual frequency
transducer. You can show data from a 200 kHz sonar signal, data from a 50 kHz sonar signal, or data
from both signals simultaneously.
1. From the Home screen, select Sonar.
2. Select a sonar view.
3. Select Menu > Frequency.
4. Complete an action:
200 kHz
• Select
shallow, inland waters.
• Select 50 kHz to show data from a 50 kHz sonar signal. This is useful mainly for deeper
waters.
• Select Dual to show both 200 kHz and 50 kHz data.
0
Sonar > Sonar Setup
> Blue.
> White.
to increase or decrease the gain manually.
Reject.
to show data from a 200 kHz sonar signal. This is useful mainly for more
> Appearance.
GPSMAP 6000/7000 Series Owner's Manual
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