Lowrance M52 S/GPS Installation And Operation Instructions Manual page 39

Main Menu.
Main Menu Commands
There are four "basic" Main Menu commands that you'll really want to
read more about. They are:
• Screen commands (
, and ): change
C B D M
ONTRAST RIGHTNESS ISPLAY ODE
the appearance of the display screen. Use these commands to adjust
how the screen looks under various lighting conditions.
• Sounds command: controls sound levels for keystrokes and alarms. If
you don't like to hear a beep each time you press a key, you can turn all
sounds off by setting the volume to zero. Sound is especially useful when
used with the Fish I.D. fish symbol feature and fish alarm feature.
• Sonar Alarms command (a sub-menu of Alarms): turns alarms on or
off and changes alarm thresholds. The fish alarm, used with Fish I.D.,
is the most popular use. It tells you when the sonar sees a fish. You can
also set deep or shallow depth alarms.
• Popup Help command (one of the System Setup options): turns the
pop-up help boxes on or off. When you select a menu command, these
information boxes appear to tell you what the command does or how to
use the command. The default setting is on, which is really handy while
you're learning.
The remaining Main Menu commands are either for GPS use, or for ad-
vanced sonar functions, mostly setting various system options. (They're all
detailed later in Sec. 4, Advanced Sonar Operation, or Sec. 7, System Setup
and GPS Setup Options.) The other Sonar options in the Main Menu are:
• Set Keel Offset command: calibrates the unit to show depth under
the keel or actual depth from the surface.
• Sonar Simulator command: turns the simulator feature on and off.
Useful for learning how to operate the unit and all its functions.
• Reset Options command: returns all options and auto functions to
their original factory settings. It's a great safety net while you're
learning and experimenting with various settings.
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