Setting Up Sonar - Garmin GPSMAP 420 Owner's Manual

Using Sonar
Press MENU to set the duration and the scale for the log.
Temp
and
depth
Time
elapsed
Temp Log
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.

Setting Up Sonar

Use the Sonar Setup screen to define and adjust settings universal to
all sonar screens.
From the Home screen, select
4
Temperature
range
Sonar > Sonar Setup.
fish Symbols—set how the sonar interprets suspended targets.
The unit does not interpret the sonar return data (default).
Suspended targets appear as symbols. Background sonar
information appears, making the distinction between fish
and structure easier.
Suspended targets appear as symbols with background
information shown. The target depth of each symbol is also
displayed.
Suspended targets appear as symbols. No background
information appears.
Suspended targets appear as symbols with no background
information shown. The target depth of each symbol is
displayed.
Scroll Speed—adjust the rate at which the sonar scrolls from
right to left (Ultrascroll , fast, Medium, or Slow). If using a
™
speed-capable transducer, select
automatically adjust to the water speed of your boat.
auto
to have the scroll speed
GPSMAP 400/500 Series Owner's Manual