Humminbird Matrix 97 - Manual (Page 48)

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Fish ID+ TM
Fish ID+ TM 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 TM Sonar models represent targets detected in the 200 kHz narrow beam as Orange
Fish Symbols, and represent targets detected in the 83 kHz wide beam as Blue Shaded Fish
Symbols.
When Fish ID+ TM is turned off, the Matrix Fishing System 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+ TM 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+ TM setting On or Off.
(Off, On, Default = Off)
Transducer Cone and Fish Arches
200 kHz, Narrow Beam
Orange Fish Symbols
83 kHz, Wide Beam Blue Shaded Fish
Symbols (DualBeam PLUS TM Only)