GPSMAP 4000 Series Owner’s Manual
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Understanding the Split Frequency Screen
Use the Split Frequency screen (dual frequency transducer only) to view both the 50kHz and
200kHz frequencies on the same screen. A 200kHz frequency graph appears on the left; a 50kHz
frequency graph appears on the right.
From the Home screen, select
Sonar
>
Split Frequency
.
Depth, temperature,
and water speed
GPS speed and
GPS heading
Transducer
frequencies
Range
Understanding the Temp Log
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 depth are shown in the top-left corner.
From the Home screen, select
Sonar
>
Temp Log
.
Temperature
and depth
Time
elapsed
Temperature
Range
The temperature appears along the right side and the time elapsed appears along the bottom. The
graph scrolls to the left as information is received.
Press
MENU
to access scale settings. Select
Duration
to set the time elapsed scale. Select
Scale
to
set the temperature range scale.
