Furuno FCV-1100L - Manual (Page 12)

1. OPERATIONAL OVERVIEW
1-4
1.5 Display Mode
Seven display modes are available with the [MODE] switch.
LF-ZOOM
LF
HF
HF-ZOOM
USER-1
USER-2
DUAL
Currently selected mode
shown in reverse video
M O D E
Display mode window
1.5.1 Single-picture (low frequency or high frequency) display
Low frequency (LF)
The lower the frequency of the ultrasonic pulse the wider the detection area.
Thus, the low frequency is suitable for general search and judging bottom
condition.
High frequency (HF)
The higher the frequency of the ultrasonic pulse the better the resolution.
Therefore, the high frequency pulse is useful for detailed observation of fish
echoes.
Low
frequency High
frequency
Frequency and Detection Area Single-frequency Picture
LF 1/1 0
20
40
60
80
0
49.6
m
0.0
Fish school
Bottom echo
Frequency and detection area, sample single picture (low frequency)