Furuno Color LCD Sounder FCV-620/585 - Manual (Page 12)

1. OPERATION
3
2. Rotate the MODE knob again to choose the
display mode desired.
The screen you chose appears soon there-
after.
Single frequency display
Low frequency (50 kHz)
The sounder uses ultrasonic signals to detect
bottom conditions. The lower the frequency of
the signal, the wider the detection area. There-
fore, the 50 kHz frequency is useful for general
detection and judging bottom condition.
High frequency (200 kHz)
The higher the frequency of the ultrasonic
signal, the better the resolution. For this reason
the 200 kHz frequency is ideal for detailed
observation of fish schools.
Frequency and coverage area
Single frequency display
Dual frequency display
The 50 kHz picture appears on the left; the 200
kHz picture on the right. This display is useful for
comparing the same picture with two different
frequencies.
Dual frequency display
Zoom display (50/200 kHz)
Zoom mode expands chosen area of the single
frequency picture. Three modes are available:
bottom lock, bottom zoom and marker zoom.
The default mode is bottom lock. To change a
mode, see page 16.
Bottom lock display
The bottom lock display provides a normal pic-
ture on the right half of the screen and a 10-30
feet (default: 15 feet) wide layer in contact with
the bottom is expanded onto the left half of the
screen. This mode is useful for detecting bottom
fish.
Bottom lock display
Note1: To adjust the range of the zoom display,
go to the Range menu (see page 20).
Note2: To turn on or off the Zoom Marker, go to
the Display menu (see page 18).
50 kHz
200 kHz
Depth
Display mode
Picture advance speed
Range scale
Gain
49.6
1/1
m
20
40
60
80
0
50k W
Bottom
Fish school
Color
bar
Alarm icon
G:AF R:A
0.0
15.5 kt
82.6
Data
box
Transmission line
Range
Minute
marker
(Each bar
equals
30 sec.)
Frequency
Beam
width
Resolu-
tion
Detectable
range
Bottom
tail
50 kHz Wide Low Deep Long
200 kHz Narrow High Shallow Short
50 kHz 200 kHz
picture picture
47.2
50/200 1/1
0
20
40
60
80
20
40
60
80
G:AF R:A W
m
0.0 0
Bottom lock
display
Zoom marker
Zoomed
fish
This section
is zoomed.
21.7
0
Single
frequency
display
Fish
school
0
40
Bottom
displayed flat
10
20
30
0
1
2
3
4
5
1/1 W G:AF R:A
m
B/L-LF