JRC JFV-700HP, Instruction Manual

Page: 58 / 89

44 3.OPERATIONS
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:
1
Display the FISH FINDER SETTING menu by pressing the
and keys together.
2
Move control to "WHITE LINE" by pressing the or key,
and display the WHITE LINE submenu by pressing the key.
3
Select either HI (high-frequency) or LO (low-frequency) by
pressing the or key.
4
Set a level at which discriminate between the sea bottom and fish
schools, by pressing the or key. The level can be set in
steps of 0.1 from 0.0 to 10. The setting of 0.0 makes the WHITE
LINE function invalid.
5
If necessary, select a WHITE LINE level for the other frequency
as well by repeating steps
3
and
4
above.
6
Press the
MARK
key to return to the FISH FINDER SETTING menu.
7
Press the
GRAPH
key to return to the fishfinding display.
WHITE LINE
level
Too low Appropriate Too high
Bottom
School
of fish
FISH FINDER SETTING WHITE LINE
WHITE LINE High-frequency
▲▲
WHITE LINE
▲
▲
HI
LO
0.0
0 5 10
0.0
MARK RETURN TO F/F MENU
GRAPH CLOSE MENU
FISH FINDER SETTING
HI
OFF AUTO
▲▲
GOTO SUB MENU
GRAPH CLOSE MENU
▲
▲
▲
▲
▲
▲
▲
▲
INTERFERENCE
COLOR REJ.
FREQ. ADJUST
TX CYCLE MODE
1 2 3 4 5 6 7 8
SIGNAL PROCESS
INITIAL SET
STC MODE
TX CYCLE ADJ.
ADC MODE
TX PULSE WIDTH
WHITE LINE
P
D C
1R1
0.0
LO
0.0
HI
D D
LO
HI 200.0 50.0 LO
LONG
OFF
SYNC.
0
50
100
1
2
150 200
ASYNC.
SHORT
1R2
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.