USING THE 250DX
MENU FUNCTIONS
Fish ID. There are three selections available: Bottom Black View
OFF, ID+ ON, and ADJUST. The factory setting is ID+ ON. With Fish ID OFF, sonar returns are displayed as “raw” information.
There is no interpretation made by the unit. Selecting ID OFF also disables the fish alarm.
ID+ ON enables the 250DX to interpret the raw sonar data and, using a variety of techniques, depict appropriate target returns as one of three different size fish symbols. Further identification shows whether the fish is in the wide or narrow beam. The 250DX also displays the depth beneath the surface with the corresponding fish symbol.
Selecting Adjust and making incremental changes 
enhances the fishfinder’s ability to identify sonar 
returns as fish symbols.
Increasing the value to a number greater than zero 
shows more fish symbols 
smaller sonar returns will be depicted as fish 
symbols. This is useful for identifying many smaller 
sonar returns (such as baitfish) as fish symbols. 
Decreasing the value to a number less than zero shows 
fewer fish symbols 
returns are disregarded. This is useful for eliminating 
many small sonar returns 
when seeking larger species 
of fish.
The 250DX remembers this selection even when 
the unit is powered off.
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