Lowrance LCX-18C, Operation Instructions Manual

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Does that mean Fish I.D. is broken? No — the feature is simply inter-
preting sonar returns in a specific way to help take some of the work
out of reading the screen. Remember: Fish I.D. is one of the many tools
we provide so you can analyze your sonar returns for maximum fish
finding information. This and other features can help you successfully
"see" beneath the boat under varied water and fishing conditions. So,
practice with the unit in both the Fish I.D. mode and without to become
more familiar with the feature. The default for Fish I.D. is off.
Sonar Features menu with Fish I.D. Symbols selected.
At left, figures 1A and 2A show Sonar Page in normal chart mode. At
right, figures 1B and 2B show the same underwater scene with Fish I.D.
turned on. Note how arches are replaced with symbols.
Fish arches
above structure
No fish shown
Fig. 1 A Fig. 1 B
Fig. 2 A
Fig. 2 B
Many fish
arches visible
Fewer fish
symbols visible
Fish symbols appear
in surface clutter