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.
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
Select WHITE LINE levels as follows:
Display the FISH FINDER SETTING menu by pressing the
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
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
key to return to the FISH FINDER SETTING menu.
key to return to the fishfinding display.
key. The level can be set in
FISH FINDER SETTING