Seiwa Techmarine, User Manual

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94 User Manual
in degrees West or East to indicate the direction of magnetic North from true
North. It changes from point to point, and (at the same point) with time.
♦
Mark
Reference point related to cursor position. Typically it represents by an icon
and label under Mark.
♦
Natural Features
Any topographic feature formed by the action of natural processes: coastlines,
relief, glaciers.
♦
Navigate mode
Operating mode (called also Home mode): all operations refer to the ship's
position. Navigate or Navigation mode is also used to indicate that the destina-
tion is placed.
♦
NMEA-0183
The NMEA-0183 Data Interface Standard was developed by the National Ma-
rine Electronics Association of America. It is an international standard that
enables equipment from many different manufactures to be connected to-
gether and share information.
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OSGB = Ordinance Survey of Great Britain
Coordinate system describing only Great Britain charts. Generally used with
GBR36 datum, which also describes only Great Britain charts. This coordinate
system cannot be used in any other part of the world.
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Pair
The two selectable secondary stations, of a Loran-C chain, which are used to
calculate the TD (Time Difference) position of a point in the map area covered
by the selected Loran-C chain.
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Pictures & Diagrams
The MAX data format allows assigning one or more image to any cartographic
object. These Pictures are typically used to facilitate the identification of carto-
graphic objects or places around the map: they can be the landscape layout
nearby a harbour, the shape of a bridge or of a buoy etc. On some objects,
such as bridges, the image associated can represent the Diagram represent-
ing the shape of the objects and the various characteristics (length, height,
type of bridge etc.).
♦
Port Info
Port Info function is a combination of a Port Info database containing all the
relevant Safety and Navigational information normally found in good pilot books
and a presentation software which displays special Port Facility Symbols.
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Ports & Services
Areas along shore with facilities for mooring, downloading and uploading of
ships, generally sheltered from waves and winds. Port installations are piers,
wharves, pontoons, dry docks, cranes... .
♦
Route
Sequence of Waypoints connected by segments (Route Legs). Among the avail-
able Routes, only one is the Active Route, which is shown by a straight line and
arrows to indicate the direction.