Furuno GP-3500F - Manual (Page 176)

11. VIDEO SOUNDER OPERATION
11-4
11.2.3 Marker-zoom display (50 kHz or 200 kHz)
The marker-zoom display expands a selected area of the normal sounder picture
to full vertical size of the screen on the left-half window. You may specify the
portion to expand by operating the VRM (Variable Range Marker). The area
between the VRM and zoom marker is expanded. (You may choose the zoom
range. For further details, see paragraph 11.19.)
AUTO C
20.0
5.6 °
C 10.0 kt
1'10"
m
VRM
This part
is zoomed.
Zoom marker
NORMAL DISPLAY
Fish school
Fish
school
MARKER-ZOOM
DISPLAY
50k
0
20
40
60
80
30
40
20
50
38.6
Marker-zoom display
11.2.4 Bottom-zoom display (50 kHz or 200 kHz)
The bottom-zoom display expands bottom and bottom fish echoes by the zoom
range selected on the menu. The bottom between the zoom markers is
expanded automatically.
AUTO C
0.0
5.6 °
C 10.0 kt
1'10"
Zoom marker
NORMAL
DISPLAY
50k
0
20
40
60
80
BOTTOM-ZOOM
DISPLAY
Bottom
m
38.6
32
34
36
38
40
42
Bottom-zoom display plus normal sounder display