Simrad NSO evo3S MPU Operator's Manual page 45

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.
Phantom Loran
Enables use of Phantom Loran positioning system.
Defines Loran chains (GRI) and preferred station for waypoint entry, cursor position and
position panel.
The graphic example shows a cursor position window with Loran position information.
For more information refer to your Loran system documentation.
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