Garmin GPSMAP 7215 - Manual (Page 109)

GPSMAP ® 6000/7000 Series Owner’s Manual 103
Sonar
Configuring the Advanced Sonar Settings
Note: These features are available only on the GSD 24 and GSD 26.
Before you can configure the temp. Source, you must have a SD 26 and more than one water-temperature
sensor or temperature-capable transducer.
With the GSD 24 and GSD 26, you can configure various sonar display and data source settings.
1. From the Home screen, select
Sonar .
2. Select a sonar view.
3. Select
Menu > More > Advanced .
4. Select one or more options:
• Select transmit to stop the transducer from transmitting.
• Select tVG to adjust the time-varying gain, which can reduce noise.
• Select echo Stretch to adjust how the targets appear on the screen. If the echo is too wide, the targets
will blend together. If the echo is too narrow, the targets might be small and difficult to see.
• Select Bottom tracking to select which frequency to use for determining depth.
• For the GSD 26, select temp. Source to select which water-temperature sensor or temperature-capable
transducer is the source for the water temperature log.
Frequencies
Selecting Frequencies
You can indicate which frequencies are used when using a dual-frequency transducer. With the GSD 26, you
can use a chirp frequency to display more-defined targets on the screen.
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.
• For the GSD 22 or GSD 24, select Dual to show both 200 kHz and 50 kHz data
• For a GSD 26 used with a broadband transducer, select High Chirp to transmit a chirp signal on the
high channel.
• For a GSD 26 used with a broadband transducer, select Low Chirp to transmit a chirp signal on the low
channel.
Managing Frequencies
Note: This feature is available only on the GSD 26.
You can set the GSD 26 to operate on a wide variety of popular, discrete fishing frequencies. For maximum
depth penetration, set the frequency to a low setting.
Setting up New Frequencies
1. From the Home screen, select Sonar .
2. Select a sonar view.
3. Select
Menu > Frequency > Manage Frequencies .
4. Select New Preset .
5. Select High or Low .
6. Enter a frequency:
• For the GPSMAP 6000 series, use the Rocker or Numeric Keypad.
• For the GPSMAP 7000 series, use the on-screen keyboard.
7. Select Done .