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Owner's Manual
HDG = Heading
The horizontal direction in which a ship actually points or heads in any
moment (see also COG).
HDOP = Horizontal Dilution Of Precision
Parameter indicating the precision of the positioning system (GPS). The
smaller HDOP value indicates higher position accurately.
Landmarks
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 traveled 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.
Terms