B&G Vulcan, Руководство оператора

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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
Most paper charts are made in the WGS84 format, which also is
used by the Vulcan.
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 chart panel.
Phantom Loran
Enables use of Phantom Loran positioning system.
Loran settings
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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