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Sonar Features menu with Fish I.D. Symbols selected on dual-
frequency menu (left); single-frequency menu (right). When the check
box to the left is checked, the feature is on.
Figures 1A and 2A show Sonar Page in normal chart mode (left). Figures
1B and 2B (right) 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
FasTrack graph
confirms fish
Fig. 1 A
Fig. 1 B
Fig. 2 A
Fig. 2 B
Many fish
arches visible
Fewer fish
symbols visible