Humminbird 1158c Combo, Installation And Operation Manual

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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.
DualBeam PLUS™ sonar models represent targets detected in the 200 kHz narrow beam as
Orange Fish Symbols and targets detected in the 83 kHz wide beam 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.
Fish ID Sensitivity
Settings: Low = 1, High = 10; Default = 5
Fish ID Sensitivity adjusts the threshold of the Fish ID+™ detection algorithms. Selecting a
higher setting allows weaker returns to be displayed as fish. This is useful for identifying smaller
fish species or baitfish. Selecting a lower setting displays fewer fish from weak sonar returns.
This is helpful when seeking larger species of fish.
Fish ID Sensitivity is used in conjunction with Fish ID+™. Fish ID+™ must be On for Fish ID
Sensitivity to affect the ability of the Fishfinder to identify sonar returns as fish.
Transducer Cone and Fish Arches
200 kHz, narrow beam
orange fish symbols
83 kHz, wide beam
blue fish symbols
Sonar Menu Tab
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