tion.
If you select a high value setting, weak returns can be de-
tected and displayed on the screen as small fishes. This is
useful if you intend to identify small fish species.
If you select a low value setting, only strong returns can be
detected and displayed on the screen as big fishes. This is
useful if you intend to identify large fish species.
To set the Fish ID Sens.:
1) Press MENU to enter into menu setting.
2) Use the Up/Down Arrow to select Sonar option.
3) Press Right Arrow to enter into Sonar setting.
4) Use the Up/Down Arrow to select the Fish ID. Sens. op-
tion.
5) Press Right Arrow to enter into the setting.
6) Press Righ/Left Arrow to increase or decrease the value.
7) Press ENT to confirm the setting.
8) Press EXIT to exit the menu setting.
6. Water type
Water Type is used to distinguish fresh water and salt wa-
ter.The sonar spread faster in salt water than in fresh water.
To display the most accurate information, it is important that
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Echofish 820 – Installation & Operation manual