Furuno NAVNET 1724C - Manual (Page 131)

4. VIDEO SOUNDER OPERATION
4-2
0.0
LF HF
Dual-frequency display
4.1.2 Description of sounder displays
Single-frequency display
Color bar
Soft keys
Variable Range Marker (white)
Depth scale
Tx frequency
Depth
Temp.
scale
(orange)
Water
temp.
graph
Water
temp.
display
114
52
Minute marker
Icons
(alarm, battery,
simulation)
Bottom echo
Zero line
Fish
echo
LF
SHIFT
AUTO/
D. BOX
DISPLY
MODE
FREQ
LF /HF
50
30
F
40
SOUNDER
SINGLE
Display mode
0
50
100
150
200
Cross-hair
cursor
0'30"
Time
S
I
M
Indications on the single frequency display
Note: The water temperature display requires an appropriate water temperature sensor. It
can be turned on or off with TEMPERATURE GRAPH on the SOUNDER MENU.
Selecting transmission frequency
The single frequency display shows either the LF (low frequency) picture or HF (high
frequency) picture. To select transmission frequency, press the FREQ LF/HF soft key. “LF”
or “HF” is highlighted on its key label with each press of the key.
Dual-frequency display
The dual-frequency display provides both
LF and HF pictures. This display is useful
for comparing the same picture with two
different sounding frequencies.
LF picture
The sounder uses ultrasonic pulses to
detect bottom conditions. The lower the
frequency of the pulse, the wider the
detection area. Therefore, the low