Garmin GPSMAP 4008 - Sonar Alarms Setup

GPSMAP
®
4000/5000 Series Owner’s Manual 93
Sonar
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 .
2. Select a sonar view.
3. Select  > .
4. Complete an action:
• Select  to show data from a 200 kHz sonar signal. This is useful mainly for more-shallow,
inland waters.
• Select  to show data from a 50 kHz sonar signal. This is useful mainly for deeper waters.
• Select  to show both 200 kHz and 50 kHz data.
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 .
2. Select a sonar view.
3. Select  > .
4. Complete an action:
• Select  to allow the chartplotter to adjust the depth scale automatically.
• Select  or to increase or decrease the depth scale manually.
5. Select .
Sonar Alarms
Setting the Shallow Water and Deep Water Alarms
1. From the Home screen, select  > >.
2. Select  > to set an alarm to sound when the depth is less than the specied value.
3. Enter the depth that triggers the shallow water alarm.
4. Select .
5. Select  > to set an alarm to sound when the depth is greater than the specied value.
6. Enter the depth that triggers the deep water alarm.
7. Select .
Setting the Water Temperature Alarm
You can set an alarm to sound when the transducer reports a temperature that is 2°F (1.1°C) above or below
the specied temperature.
1. From the Home screen, select  >  > > >.
2. Enter a water temperature.
3. Select .