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Three different fish size icons represent the intensity of the sonar return, and provide an indicator of relative fish size. DualBeam PLUSTM 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. 200 kHz, Narrow Beam 83 kHz, Wide Beam Shaded Fish Symbols Hollow Fish Symbols When Fish ID+TM is turned off, the 700 Series™ Fishing System shows only the raw sonar returns on the display.