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10. VIDEO SOUNDER OPERATION
10-6
Bottom-lock display
The bottom-lock display provides a compressed normal picture on the right half of the
screen and a 15 or 30 feet (5 or 10 meter) wide layer in contact with the bottom is ex-
panded onto the left half of the screen. This mode is useful for discriminating bottom
fish from the bottom echo.
Note: The range of the bottom-lock display can be changed at BOTTOM LOCK
RANGE on RANGES menu.
Bottom-lock display plus normal sounder display
Bottom-zoom display
The bottom-zoom display expands bottom and bottom fish echoes by the chosen
zoom range 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.
Note: The range of the bottom-zoom can be changed at ZOOM RANGE on RANGES
menu.
Bottom-zoom display plus normal sounder display
50k
88.7
0
Single frequency
display
Fish school
Bottom-lock
display
Zoom marker
This part is
zoomed.
50
0
10
20
30
Fish
school
ft
100
0.0
50k
Single frequency display
Bottom-zoom display
Zoom marker
59.8
ft
Bottom
50
100
70
60
50
When depth changes,
the marker follows it automatically.