Once the Fish Alarm is enabled, the 100SX emits an audible beep when the selected size fish symbol appears
To disable the Fish Alarm, press MENU until the Fish Alarm menu appears
Fish ID
The Fish ID menu controls the method used to portray fish. There are three selections available: ID Off, ID On, ID+. The factory setting is ID+. With ID Off, sonar returns are displayed as "raw" information. There is no interpretation made by the unit. Selecting ID Off will also disable the Fish Alarm if selected.
ID On enables the 100SX to interpret the raw sonar data and using a variety of techniques, depicts appropriate returns as one of three different size fish symbols.
Use the arrow buttons to highlight the desired setting.