2-2
2.3.2 Display mode description
HF, LF (high frequency, low frequency) mode
The sounder uses ultrasonic pulses to detect bottom conditions. The lower the frequency of the
pulse the wider the detection area. Therefore, the 50 kHz frequency is useful for general
detection and judging bottom conditions, while the 200 kHz frequency is useful for detailed
observation of fish schools.
49.6
0.0
Fish
school
Bottom
0
20
40
60
80
DUAL frequency mode
This mode provides the 50 kHz picture on the left-half of the screen and the 200 kHz on the right
half, and is useful for detecting fish schools which have different reflection characteristics with
frequency. For example, a school of tiny fish like minnow returns stronger echoes on a high
frequency compared to a low frequency.
60
49.6
0.0
50 kHz 200 kHz
picture picture
0
20
40
80
0
20
40
Summary of Contents for FCV-667
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