Humminbird 1197C SI - Manual (Page 138)

When Fish ID+™ is turned off, the 1100 Series™ 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.
To turn Fish ID+™ on or off:
1. Highlight Fish ID+ on the Sonar main menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to turn the Fish ID+™ setting On or Off. (Off,
On, Default = Off)
Fish ID Sensitivity
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 Sensitivity is used in conjunction with Fish
ID+™. Fish ID+™ must be On for Fish Sensitivity to affect the ability of the 1100 Series™ to identify sonar
returns as fish.
To change the Fish ID Sensitivity setting:
1. Highlight Fish ID Sensitivity on the Sonar main menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Fish Sensitivity setting. (Low = 1,
High = 10, Default = 5)
Transducer Cone and Fish Arches
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