Lowrance Hook Reveal X Series Operator's Manual page 67

Key beeps
Controls the loudness of the beep sound when a key is pressed.
Time
Controls the local time zone offset, and the format of the time and
date.
Datum
Most paper charts are made in the WGS84 format.
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 displayed on the panel.
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.
Restore defaults
Allows you to select which settings are to be restored to their
original factory settings.
Warning:
If waypoints, routes, and trails are selected,
they are permanently deleted.
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Tools | Hook Reveal X Series Operator Manual