Furuno COLOR VIDEO PLOTTER 1933C - Manual (Page 149)

4. VIDEO SOUNDER OPERATION
4-5
200k
80
42.0
MARKER-ZOOM
DISPLAY
Fish school
Fish
school
This part
is zoomed.
Zoom marker
VRM
NORMAL
DISPLAY
50
0
100
-
-
-
-
-
-
-
-
-
- -
50
60
70
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0'20"
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.
200k
20.0
Bottom
NORMAL DISPLAY
Zoom marker
BOTTOM-ZOOM
DISPLAY
80
50
0
100
-
-
-
-
-
-
-
-
-
-
0
10
20
30
--
--
--
--
--
--
-
Bottom-zoom display plus normal sounder display