Garmin GPSMAP 4008 - Adjusting Sonar Gain for Clarity

92 GPSMAP
®
4000/5000 Series Owner’s Manual
Sonar
2. Complete an action:
• Select  to turn on the whiteline with the most-sensitive setting. Almost all strong returns are
highlighted in white.
• Select  to turn on the whiteline with many strong returns highlighted in white.
• Select  to turn on the whiteline with the least-sensitive setting. Only the strongest returns are
highlighted in white.
Setting the Color Scheme
1. From the Home screen, select  >  > .
2. Complete an action:
• Select  > .
• Select > .
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 .
2. Select a sonar view.
3. Select  > .
4. Complete an action:
• Select to allow the chartplotter to adjust the gain automatically.
• Select  or to increase or decrease the gain manually.
5. Select .