Humminbird 300 SERIES 345C DI - Manual (Page 71)

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Fish ID+™
Settings: Off, On; Default = Off
Fish ID+™ uses advanced signal processing to interpret sonar returns and will
display a Fish Symbol when very selective requirements are met. When a fish is
detected, a fish icon and its depth are displayed above the return that has been
classified as being a fish. Three different fish size icons represent the intensity of
the sonar return and provide an indicator of relative fish size.
In DualBeam PLUS™ models (345c), targets detected in the 200 kHz narrow
beam are represented as orange fish symbols, and targets detected in the 83
kHz wide beam are represented as blue fish symbols.
In Down Imaging™ models (345c DI), targets detected in the 455 kHz conical
beam are represented as orange fish symbols, and targets detected in the 200
kHz conical beam are represented as blue fish symbols.
When Fish ID+™ is turned off, the Fishfinder shows only the raw sonar
returns on the display. These returns will often result in “arches“ forming on the
display, indicating potential targets. Due to the transducer beam angle, the
distance to a fish decreases as the fish moves into the beam, and then
increases as it moves out again, creating a Fish Arch when this distance change
is shown on the display. Boat speed, chart speed, and the position of the fish
within the sonar beam greatly affect the shape of the arch.
Transducer Cone and Fish Arches
Narrow Beam
Orange Fish Symbols
Wide Beam
Blue Fish Symbols
Sonar Menu Tab