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4. VIDEO SOUNDER OPERATION
4-5
Marker-zoom display plus normal sounder display
Bottom-zoom display
The bottom-zoom display expands bottom and bottom fish echoes by the zoom
range selected on the SOUNDER RANGE SETUP menu (see paragraph 5.9.3),
and is useful for determining bottom hardness. A bottom displayed with a short
echo tail usually means it is a soft, sandy bottom. A long echo tail means a hard
bottom.
Bottom-zoom display plus normal sounder display