Vexilar LC-507 - Manual (Page 14)

14
ADJUSTING THE C-LINE
C-LINE or Clean Line, affects the way the bottom and
fish are displayed. Clean Line will “clean out” harder
targets. To increase the level of C-LINE, press the up
arrow. To decrease the level, press the down arrow. There
is no display indicator to tell you the level of C-LINE,
but the changes will be apparent in the display of the bottom and
targets.
The level of C-LINE is, largely, a matter of taste. However there
is a basic rule to follow. The C-LINE should clean out the bottom
signal, but not the fish. To get to this point, first set the C-LINE to
its minimum level. Press and hold the C-LINE down arrow. The unit
will beep once for each change in C-LINE level. Reduce the level
until the unit sounds a high pitched beep, indicating no more adjust-
ment is available. The bottom signal should now be all black. Now,
increase the level until the bottom signal cleans out, similar to fig-
ure 22. You can increase the level more, if you wish, but do not turn
it up so high that you lose the black line indicating the leading edge
of the bottom.
The idea is that you find the level of Clean Line appropriate for
the depth and type of bottom you are over. A properly adjusted
Clean Line will make fish identification, near or on the bottom, very
easy. It also will make it easy to spot a harder area of the bottom. In
figure 22 you can see the difference between a properly set C-LINE
and one that is set too
low Notice how much
easier it is to distinguish
the fish that are close to
the bottom when the
Clean Line is adjusted
properly. If the Clean
Line is set too low the
fish tend to merge with
the bottom and become
invisible. If the Clean
Line is set too high you
can get the same results.
Figure 22