Resetting The Unit To Factory Defaults; Default Settings - Raymarine L750 Operating Handbook

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Temp On/Off
An entry for temperature may appear on the Downlooker page.
You can turn this item off using this line of the System Setup
display. Use the left- and right-controls on the Trackpad to change
the setting. (This item will still appear on the Window and Digital
displays.)

Resetting the Unit to Factory Defaults

It is easy to reset all of the settings on the Fishfinder to the original factory
settings. When the unit is off, press and hold the Enter key while
pressing the Power key. The unit will display the message, "EEPROM
initialization. Press the Enter key to exit." To go back to normal
operation, press the Enter button. All of the settings will be reset to the
values listed below.

Default Settings

When the Fishfinder is new, it uses a number of preset "default" settings.
Here is a list:
Function
Range
Sensitivity
Chart Speed
Zoom
Frequency
Simulator
Fish symbols
White line
Sidelooker
Depth units
Temperature unit
Speed units
Shallow alarm
Fish alarm
Deep alarm
Buzzer
Speed/temp/log
L750 Fishfinder: Installation and Operation Handbook
Default – US model
Auto
Auto
3 (fast)
Auto/x2
200 kHz
Off
Off
Off
Off
FT (feet
°F (Fahrenheit)
MPH (miles per hour)
Off
Off
Off
Both
On
Default – European model
Auto
Auto
3 (fast)
Auto/x2
200 kHz
Off
Off
Off
Off
M (meters)
°C (Celsius)
KPH (kilometers per hour)
Off
Off
Off
Both
On