Garmin GPSMAP 400 GPS Receiver User Manual


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GPSMAP
®
400 Series Owner’s Manual 35
uSInG Sonar
usInG sonar
When connected to a transducer, your unit becomes a powerful
shnder/asher.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 Sonar > Full Screen.
Transducer
frequency or
beam width
Temperature
Speed
Depth
Range
Suspended
targets
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ashes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asher,fromtheHomescreen,select
Sonar > Flasher.
Flasher ring
Depth
Water
Temp
Voltage
Water
speed
Odometer
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