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86 GPSMAP 188/188C Sounder Owner’s Manual
USING SONAR > SONAR TAB OPTIONS
Depth Number—controls the efficiency of the digital depth update
rate. Fast Update updates more quickly and is recommended for
low-noise, deeper water (>50 ft). Auto is best for shallow water or
high noise areas, and produces a slower screen update. Use Auto
when you travel a wide variety of depths.
NOTE: If the unit is unable to track the bottom for any reason,
the digits in the depth window flash on and off to alert you that
the unit is not tracking the bottom.
Main Menu—Sonar Tab
Scale—controls the depth Scale displayed vertically along the right
side of the graph. The depth Scale can be configured to display four
different ways: as an Overlay, in the Corners, with Basic, or No
Scale.
Color Bar—shows a gradient scale of the current Target Level
setting (see page 81).
Depth Scale (Overlay)
Color Bar
Flasher
Flasher—with the Flasher active, a graphic Flasher representation
is displayed on the far right side of the graph. This graphic Flasher
displays structure and bottom returns much the same as a true
Flasher. This feature is particularly useful when using fish symbols.