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GPSMAP 400/500 Series Owner’s Manual 
5
Using Sonar
Understanding the Depth Log Screen
The Depth Log screen keeps a graphic log of depth readings over 
time. The present depth is shown in the top-left corner.
  From the Home screen, select 
Sonar
 > 
Depth Log
.
Press 
MENU
 to set the duration and the scale for the log.
Depth 
range
Depth
Time 
elapsed
Depth Log
The depth appears along the right side, and the time elapsed appears 
along the bottom. The graph scrolls to the left as information is 
received.
Understanding the Temp Log Screen
If you are using a temperature-capable transducer, the Temp Log 
screen keeps a graphic log of temperature readings over time. The 
current temperature and the depth are shown in the top-left corner.
  From the Home screen, select 
Sonar
 > 
Temp Log
.
Press 
MENU
 to set the duration and the scale for the log.
Temperature 
range
Time 
elapsed
Temp 
and 
depth
Temp Log