Humminbird Marine GPS System Marine GPS User Manual

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Fish ID+™
Settings: Off, On; Default = On
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.
DualBeam sonar models represent targets detected in the 200 kHz narrow
beam as Shaded Fish Symbols and targets detected in the 83 kHz wide beam
as Hollow 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
200 kHz, Narrow Beam
Shaded Fish Symbols
83 kHz, Wide Beam
Hollow Fish Symbols
Sonar Menu Tab

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