Memory
This unit has permanent memory that saves all user settings, even when power is removed. It does not require, nor does it use an internal backup battery, so you never have to worry about replacement batteries.
Menus
Your sonar unit will work fine right out of the box with the factory default settings. You only need to learn a few basic functions to enhance your viewing. We'll discuss them briefly here, then discuss them and all the other commands in more detail in Sec. 4, Advanced Sonar Operation.
Sonar Mode has two primary menus: the Main Menu and the Sonar Menu.
Main Menu
The Main Menu contains basic function and setup option commands. You access the Main Menu by pressing MENUMENU. You execute a command by using ↑ or ↓ to highlight a command and pressing ENT. To clear the Main Menu screen and return to the main page display, press EXIT.
Main Menu.
Main Menu Commands
Screen: changes the appearance of the display screen.
Sounds: controls sound levels for keystrokes and alarms.
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