Plastimo ECHOFISH 820 Manuel D'installation Et D'utilisation page 39

alarm tone or not when it detects what it determines to be a
fish. When the option is "on", the sonar unit will sound an
alarm; and it will not sound when the option is "off".
To set the Fish ID.
1) Press MENU to enter into menu setting.
2) Use the Up/Down Arrow to select Alarm option.
3) Press Right Arrow to enter into Units setting.
4) Use the Up/Down Arrow to select the Fish ID. Option.
5) Press Right Arrow to enter into the setting.
6) Press Up/Down Arrow to change the option.
7) Press ENT to confirm the setting.
8) Press EXIT to exit the menu setting.
22. Shallow
The Fishfinder sounds an alarm tone when the bottom goes
shallower or equal than the alarm's setting.
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Echofish 820 – Installation & Operation manual