Humminbird 300 SERIES 345C DI - Manual (Page 72)

Fish ID Sensitivity
Settings: Low = 1, High = 10; Default = 5
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 ID Sensitivity is used in conjunction with Fish ID+™. Fish ID+™ must be
on for Fish ID Sensitivity to affect the ability of the Fishfinder to identify sonar
returns as fish.
Real Time Sonar (RTS™) Window
Settings: Wide, Narrow, Off; Default = Narrow
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
What’s on the Sonar Display for more information.
NOTE: The Wide RTS Window™ does not use grayscale.
RTS Window™ (Wide) RTS Window™ (Narrow) RTS Window™ (Off)
Sonar Menu Tab 63