34 DSM25 Owner’s Handbook
These factors are proportioned to the range. Therefore, as the range
increases, the area shown in the zoom window also increases.
—
or
—
• XR to adjust manually the range shown in the Zoom window. When using
Ranged Zoom, the area shown in the zoom window does not change
when the range changes. Press ZOOM RANGE and use the rotary knob to
adjust the range as desired.
If you have chosen the split screen option, the zoomed section is indicated on
the standard fishfinder screen by a zoom box (see preceding illustration).
4. Press CANCEL or ENTER to return to the standard fishfinder soft keys.
Adjusting the Position of the Zoomed Area
1. Toggle ZOOM POSITION to:
• AUTO to automatically select the zoom position so that the bottom details
are always in the lower half of the display. This is the default.
• MAN and select ZOOM START. You can now use the rotary knob to select
the portion of the image to be zoomed.
2. Press CANCEL or ENTER to return to the default display.
Note:
Selecting Zoom automatically switches OFF Bottom Lock and A-Scope images.
3.6 Bottom Lock
When you are looking for fish that feed close to the bottom, you can use the
Bottom Lock function to filter out and flatten the bottom structure and display the
fish (or any other objects directly above the bottom) more clearly.
The scrolling bottom display provides a top-down view, referenced from the
surface of the water. With Bottom Lock, range intervals are measured up from the
bottom (rather than down from the surface). Thus, the bottom is shown as zero
and the top number indicates the maximum distance above the bottom being
displayed.
Bottom Lock can either replace or appear alongside the standard image.
The default setting is OFF.
B-LOCK RANGE
20ft
BOTTOM SHIFT
10%
D8217-2
BOTTOM LOCK
ON SPLIT OFF
81254.book Page 34 Monday, March 6, 2006 2:29 PM
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