Si-tex SNS-1100 User Manual page 88

can be placed on any location of the map, an existing Mark point or on a predefined Route.
• GPS = Global Positioning System
Satellite based navigation system operated by the US Department of Defence. It gives the
navigator a position 24 hours a day, 365 days a year under any weather conditions.
• HDG = Heading
Horizontal direction in which a ship actually points or heads in any moment (see also COG).
• HDOP = Horizontal Dilution Of Precision
Precision of the positioning system (GPS). The smaller HDOP value indicates higher position
accurately.
• Home mode
All operations refer to the ship's position.
• Landmarks
Landmarks are any prominent object such as monument, building, silo, tower, mast, ..., on
land which can be used in determining a location or a direction.
• Latitude
Angular distance North or South of the equator measured by lines encircling the earth parallel
to the equator in degrees from 0° to 90°.
• LAT/LON
Coordinate system using Latitude and Longitude coordinates to define a position on earth.
• Lat/Lon Grid
Grid of parallels (of Latitude) and meridians (of Longitude) drawn on the map.
• LOG Speed
Speed of the vessel relative to the water, provided by an instrument with a submerged
transducer for measuring the distance/speed travelled by the vessel.
• Longitude
Angular distance East or West of the prime meridian (Greenwich meridian) as measured by
lines perpendicular to the parallels and converging at the poles from 0° to 180°.
• Loran
Positioning system which determines the current position of the vessel by measuring the
difference in the times of reception of synchronized radio pulse signals transmitted by two or
more fixed stations.
• Magnetic Deviation
Value, expressed in degrees East or West that indicates the direction in which the north
indicator on the compass card is offset from the magnetic north (the difference expressed in
degrees East or West between the compass north and the magnetic north).
• Magnetic Variation
Angle between the magnetic and geographic meridians at any place, expressed 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 destination is placed.
• NMEA-0183
The NMEA-0183 Data Interface Standard was developed by the National Marine Electronics
Association of America. It is an international standard that enables equipment from many
different manufactures to be connected together and share information.
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