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1. OPERATIONAL OVERVIEW
1-9
1.7 Choosing a Frequency
You may choose low frequency or high frequency, with the LF/HF key. The display shows HI
or LO at the top of the screen depending on your selection. Use the table below to
determine which frequency to use.
Item Low frequency High frequency
Long-range detection PREFERABLE
Attenuation loss is small on low
frequency.
NOT RECOMMENDED
Attenuation loss is great on high
frequency.
Use in shallow waters NOT RECOMMENDED
Bottom echo is prominent
because of wide beam width so
fish echoes are hidden.
PREFERABLE
Bottom echo is less prominent
because of narrow beam width
so fish echoes are easy to find.
Detection range
(detection “leaks”)
PREFERABLE
Detection area is wide (beam
width is wide).
NOT RECOMMENDED
Detection area is narrow (beam
width is narrow).
Detection of bottom
fish
NOT RECOMMENDED
Fish echo and bottom echo
overlap.
(Wide beam width)
PREFERABLE
Fish echo and bottom echo are
displayed separately.
(Narrow beam width)
Detection of bait fish NOT RECOMMENDED
Not suited for this purpose.
(Bait fish are not easily detected
with low frequency.)
PREFERABLE
Well suited for this purpose.
(Bait fish are more easily
detected with high frequency.)
Affected by air
bubbles from other
vessels
NOT RECOMMENDED
Low frequency is easily interfered
by cavitation from other vessels.
PREFERABLE
High frequency is not easily
interfered by cavitation from other
vessels.
The dual-frequency display is useful for comparing the picture from one frequency against
the other to overcome deficiencies in both. Use the single-frequency for objective-specific
fishing.
High frequency
Low frequency