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78 GPSMAP 188/188C Sounder Owner’s Manual
USING SONAR > SONAR PAGE
USING SONAR
This section covers the additional sonar options for the GPSMAP
188/188C Sounder when used in conjunction with a transducer.
Read the Transducer’s Installation Instructions to properly install
the transducer.
NOTE: You MUST have a transducer installed and connected
to your GPSMAP 188/188C Sounder to use the sonar features.
Sonar Page
The Sonar Page is where your GPSMAP 188/188C Sounder
becomes a powerful fishfinder/flasher. To view the Sonar Page,
press PAGE or QUIT repeatedly until it appears. Fish are
displayed as colored arches or as fish icons. Both fish icons and
arches are displayed in three different sizes. Thermoclines are
shown as shades of blue. The area of strongest sonar return is
displayed as solid white (if Whiteline is active. Typically, the
bottom is the primary whiteline. A thin whiteline indicates a soft
bottom and a thick whiteline follows the contour of the bottom
and show any objects of reasonable size. For more information on
understanding sonar and the display, see page 89.
Sonar Page
Adjustment
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