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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
50
30
Temp.
scale
Water
temp.
graph
Water
temp.
display
50.0
°F
Minute marker
Icons (alarm,
battery,
simulation)
Bottom echo
Zero line
Fish
echo
LF
40
AUTO/
D.BOX
SHIFT
FREQ
LF/HF
DISPLY
MODE
0
50
100
150
200
120
SOUNDER
SINGLE
Display mode
SOUNDER DUAL
SOUNDER SINGLE
SOUNDER M. ZOOM
SOUNDER B. ZOOM
SOUNDER B/L
SOUNDER B/D
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
frequency is useful for general detection and judging bottom condition.