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JRC JFV-700HP Instruction Manual: Discriminating Between The Sea Bottom And Fish Schools (white Line)

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Descriminating between the Sea Bottom and Fish Schools (WHITE LINE)
You can reject signals (colors) in the order of descending signal intensity
to discriminate between the sea bottom and fish schools or determine
the volume of a fish school. To monitor fish groups on and around the
sea bottom, set the white line to erase the strongest signal that
represents the sea bottom (reddish brown). To make this function
invalid, set "WHITE LINE" to 0.0.
WHITE LINE
Too low
level
To specify the bottom identification level in water depth display
mode (DEPTH) or in bottom-based expand mode (LOCK), select
BOTTOM DECISION LEVEL from the INITIAL SETTING submenu
by independent operations. For further details, see "Adjusting the
bottom identification level (BOTTOM DECISION LEVEL)" on page
56.
Select WHITE LINE levels as follows:
Display the FISH FINDER SETTING menu by pressing the
and
keys together.
Move control to "WHITE LINE" by pressing the
and display the WHITE LINE submenu by pressing the
Select either HI (high-frequency) or LO (low-frequency) by
pressing the
Set a level at which discriminate between the sea bottom and fish
schools, by pressing the
steps of 0.1 from 0.0 to 10. The setting of 0.0 makes the WHITE
LINE function invalid.
If necessary, select a WHITE LINE level for the other frequency
as well by repeating steps
Press the
Press the
44 3.OPERATIONS
Appropriate
or
key.
or
and
key to return to the FISH FINDER SETTING menu.
MARK
key to return to the fishfinding display.
GRAPH
School
of fish
Bottom
Too high
or
key,
key.
key. The level can be set in
above.
FISH FINDER SETTING
WHITE LINE
High-frequency
WHITE LINE

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