Lowrance HDS Live Operator's Manual page 178

Time
Configure time settings to suit vessel location, along with time and
date formats.
Quick access keys
Sets action when configurable keys are pressed.
Wireless remote controller quick access keys
Sets action when configurable wireless remote controller keys are
pressed.
Datum
Most paper charts are made in the WGS84 format, which also is
used by the HDS Live.
If your paper charts are in a different format, you can change the
datum settings accordingly to match your paper charts.
Coordinate system
Several coordinate systems can be used to control the format for
latitude and longitude coordinates.
Magnetic variation
Magnetic variation is the difference between true bearings and
magnetic bearings, caused by different locations of the Geographic
and the Magnetic north poles. Any local anomalies such as iron
deposits might also affect the magnetic bearings.
When set to Auto, the system automatically converts magnetic
north to true north. Select manual mode if you need to enter your
own local magnetic variation.
Satellites
Status page for active satellites.
WAAS (and EGNOS) differential position correction can be
configured to ON or OFF.
Restore defaults
Allows you to select which settings are to be restored to their
original factory settings.
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Tools and settings| HDS Live Operator Manual