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80 GPSMAP 198C Sounder Owner’s Manual
USING SONAR > SONAR PAGE
Range Adjustment
Zoom Adjustment
Range—sets the screen depth range used for viewing. The unit can
be set to automatically track the bottom or set to a user-specified
depth range. Auto mode shows the most information possible while
continuously showing the bottom.
Zoom—used to quickly select a screen zoom scale or split
the screen. When a scale other than No Zoom is selected, the
Adjustment Menu shows a new selection labeled View. The Zoom
setting is divided into six levels:
4X Split Zoom (Dual Frequency Mode)
• 2X Split—shows two reduced-size sonar pictures at the
same time. The right half of the screen shows the complete
sonar picture at its original scale. The left half shows a
portion of the original picture at 1/2 depth scale.
• 2X Zoom—shows the 2X zoomed picture on the full screen
and does not show the original depth scale.
• 4X Split—shows two reduced pictures; the right at the
original depth scale and the left at 1/4 the original depth
scale.
• 4X Zoom—shows only the 4X zoomed picture on the full
screen. However, if Dual Frequency screen is set to Split,
then a 50/200kHz split screen shows.