Using Sonar; Understanding The Full Screen; Understanding The Flasher - Garmin GPSMAP 400 Owner's Manual

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When connected to a transducer, your unit becomes a powerful
fishfinder/flasher. If your unit does not have a built-in sounder, you
can connect a Garmin GSD 21 or GSD 22 sounder module to your
unit to use the sonar features.

Understanding the Full Screen

Select the Full Screen option to view a full-screen graph of the
transducer's sonar readings.
From the Home screen, select
Depth
Temperature
Speed
Suspended
targets
Transducer
frequency or
beam width
GPSMAP 400 Series Owner's Manual
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s
onar
Sonar > Full Screen.
Range

Understanding the Flasher

The Flasher screen (dual beam transducer only) provides an almost
instantaneous return of what is below your boat. The depth scale is
organized as a ring that starts at the top, or 12:00, and progresses
clockwise. Sonar information flashes on the ring when it is received
at the depth indicated on the inside ring. Like the regular graph, the
colors indicate different strengths of the sonar return.
To open the flasher, from the Home screen, select
Voltage
Flasher ring
Water
speed
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Sonar > Flasher.
Water
Temp
Depth
Odometer
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