Garmin GPSMAP 700 - Adjusting the Gain on the Sonar Screen; Selecting Frequencies; Adjusting the Range of the Depth Scale

GPSMAP
®
700 Series Owner’s Manual 81
Sonar
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.
3. Select
Menu > Gain.
4. Complete an action:
Select Auto to allow the chartplotter to adjust the gain automatically.
Select Up or Down to increase or decrease the gain manually.
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 81).
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 Reject.
4. Select
Up or Down.
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:
Select 200 kHz to show data from a 200 kHz sonar signal. This is useful mainly for more-
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 on a split screen.
Adjusting the Range of the Depth Scale
You can adjust the range of the depth scale that appears on the right side of the screen.
1. From the Home screen, select
Sonar.
2. Select a sonar view.
3. Select
Menu > Range.
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