Humminbird 531427-1_D - Manual (Page 63)

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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 Shaded
Fish Symbols, and represent targets detected in the 83 kHz wide beam as Hollow Fish Symbols.
When Fish ID+ TM is turned off, the 700 Series™ 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+™ 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
Shaded Fish Symbols
83 kHz, Wide Beam
Hollow Fish Symbols