Anatec ALF 500 Mode D'emploi page 10

Depth Range
Depth range determines in which portion the bottom will display in the screen (for
example, if the actual depth is 10 m, and the current depth range is 20 m, then the
bottom will display on 50% portion of the screen.
The default setting is auto, which will keep the bottom always display in a proper
portion on the screen. However in some certain situation, you could also manually
select a depth range.
Night mode
By activating this mode, the screen background becomes black and the backlight
intensity is reduced. It is also possible to remove the key tones for more discretion.
Note that the display brightness can also be adjusted in the "Backlight" menu.
RC Channel
This setting will allow you to avoid interference problems with other users operating
on the same place. 20 receiver channels are available.
Backlight
Backlight allows the unit to be used at night.
There are 10 levels for you to adjust the brightness of backlight.
Background
Change the background of the screen (white, blue or black color).
Color Scheme
Set displaying bottom in color mode or in sandy style.
Color line
Separate strong sonar echoes from weak sonar echoes. That makes it easier to
distinguish texture of the bottom
Beeper
Set if the sonar unit sound a tone or not when a key is pressed.
Fish alarm
Fish alarm sounds when the fishfinder detects what it determines to be a fish.
Sallow alarm
The fishfinder sound an alarm tone when the bottom goes shallower or equal than
the alarm's setting.
Measure Units
Set the units of measure for all depth-related readout.
Language
Language is used to choose the language of menu operation.
System reset
System reset is used to restore original factory setting.