Lowrance M68C IceMachine, Installation And Operation Instructions Manual

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40
NOTE:
If you want to change the sensitivity in Manual Mode, first turn off
Auto Sensitivity: from the Sonar Page, press
MENU
|
↓
to
A
UTO
S
ENSITIVITY
|
ENT
|
↑
to
S
ENSITIVITY
|
ENT
. Press
↓
or
↑
to pick a different
sensitivity setting. When it's set at the desired level, press
EXIT
.
Important Tip:
While you are experimenting and learning, it's possible to scramble
the settings so that the sonar picture disappears from your screen.
If that happens, remember that it's easy to switch back to full
automatic operation by simply restoring the factory auto settings.
Here's how:
To Restore Factory Settings
1. Press
MENU
|
MENU
|
↓
to
S
YSTEM
S
ETUP
|
ENT
|
↓
to
R
ESET
O
P-
TIONS
|
ENT
.
2. The unit asks if you want to reset all the options. Select
Y
ES
and
press
ENT
. All options are reset, and the unit reverts back to the
original settings.
Fish Symbols vs. Full Sonar Chart
You may have noticed in the quick reference that we used fish arches in
full sonar chart mode for our example, and not the popular Fish I.D.

fish symbol feature. Here's why.
Fish I.D. is an easier way for a sonar novice to recognize a fishy signal
return when he sees it. However, locating fish by symbol
only
has some
limitations.
Your sonar unit's microprocessor is remarkably powerful, but it can be
fooled. Some of the echoes
calculated to be fish could be tree limbs or
turtles! To see what's under your boat in maximum detail, we recom-
mend you turn off Fish I.D. and begin learning to interpret fish arches.
Fish I.D. is most handy when you're in another part of the boat or per-
forming some task that prevents you from watching the sonar screen.
Then, you can turn on Fish I.D. and the audible fish alarm. When that
lunker swims under your boat, you'll hear it!
Fish I.D. can also be useful when you want to screen out some of the
sonar detail gathered by your unit. For example, in one case fishermen
in San Francisco Bay saw clouds of clutter in the water but no fish
arches. When a down rigger was pulled up, it brought up several small
jellyfish. The fishermen switched their Lowrance sonar to Fish I.D.,
which screened out the schools of jellyfish and clearly showed the game
fish there as fish symbols.