Simrad GO XSE Series Operator's Manual page 67

Ú Note:
The distance between any waypoints in a route must not
be smaller than the radius of the waypoint arrival circle.
XTE limit
Defines how far the vessel can deviate from the selected route. If
the vessel goes beyond this limit, an alarm is activated.
Arrival alarm
When the arrival alarm is enabled, an alarm is activated when the
vessel reaches the waypoint or when it is within the specified arrival
radius.
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.
Datum
This system uses the WGS datum format, which is a standard for use
in cartography and satellite navigation (including GPS).
You can change the datum format to match other systems.
Coordinate system
Used to set the geographic coordinate system used on your system.
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Navigating | GO XSE/XSR Operator Manual