Humminbird 531444-1_A - Manual (Page 21)

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Fish ID Sensitivity
Fish ID Sensitivity adjusts the threshold of the Fish
ID+ TM 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+
TM . Fish ID+ TM must be On for Fish ID Sensitivity to affect the ability of the
Fishing System 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 ID
Sensitivity setting. (Low = 1, High = 10, Default = 5)
Real Time Sonar (RTS®) Window
RTS® Window sets the RTS® Window to either Wide
or Narrow, or turns it off in the Sonar View. The RTS® Window always updates at the
fastest rate possible and only displays returns that are within the transducer beam.
(See Real Time Sonar (RTS®) Window for additional detail).
To change the RTS® Window setting:
1. Highlight RTS Window on the Sonar main menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the RTS®
Window setting. (Wide, Narrow, Off, Default = Wide)
RTS® Window (Narrow) RTS® Window (Off) RTS® Window (Wide)
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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.
Targets detected in the 200 kHz narrow beam are represented as Shaded Fish
Symbols, and targets detected in the 83 kHz wide beam are represented as Hollow
Fish Symbols.
When Fish ID+ TM is turned off, the 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
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