Operation Manual

149
User Manual
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 Depth Lines
Imaginary lines connecting points of equal water depth.
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 DGPS = Differential GPS
Provides even greater positioning accuracy than standard GPS.
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 DSC = Digital Selective Calling
Method of establishing a VHF radio call; it is used to announce urgent maritime safety information
broadcasts. This system allows mariners to instantly send Distress Call or/and Position Request to the
other vessels equipped with a DSC transceiver within range of the transmission.
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 Event
User Point that refers to the ship's position. It is simply a way of marking where the boat is.
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 File
Collection of information (of the same type) stored on a User C-CARD. Each file must have a unique
name, ideally one that describes its contents. Filenames are kept in a directory on each User C-CARD.
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 Goto
Sets a particular mark on the map, called Target or Destination.
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 GPS = Global Positioning System
It is a satellite based navigation system operated by the US Department of Defense. It gives the naviga-
tor a position 24 hours a day, 365 days a year under any weather conditions .
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 HDG = Heading
The horizontal direction in which a ship actually points or heads in any moment (see also COG).
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 HDOP = Horizontal Dilution Of Precision
Index for position-fixing accuracy. The smaller the HDOP value, the more accurately the position can
be fixed
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 Home
In this operating mode (called also Navigate mode) all operations refer to the ship's position.
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 Latitude
The angular distance North or South of the equator measured by lines encircling the earth parallel to
the equator in degrees from 0° to 90°.
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 LAT/LON
Coordinate system using Latitude and Longitude coordinates to define a position on earth.
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 LOG
Speed of the vessel relative to the water.
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 Longitude
The angular distance East or West of the prime meridian (Greenwich meridian) as measured by lines
perpendicular to the parallels and coverging at the poles from 0° to 180°.
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 Loran
The Loran Chains are groups of transmitting stations that use timed radio pulse transmissions.
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 Magnetic Deviation
The angle between the Magnetic North and the Compass North.
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 Magnetic Variation
The 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.