Seiwa Techmarine, User Manual

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91 User Manual
Terms
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ALT = Altitude
Altitude of GPS Antenna on the medium sea level.
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Alter = Alternate Solution (TD Coordinates System)
Parameter selected by the user that is applied in the conversion of TD values
to geographical coordinates Lat/Lon. It defines which of the two possible solu-
tions can be used.
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Arrival Time
Estimated time of day you will reach your destination, based on your current
Speed and Track from GPS.
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ASF = Additional Secondary phase Factor (TD Coordinates System)
Correction to TD values which can be inserted by the user.
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Azimuth
Angular measurement from the horizon to a satellite or another object.
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AWD = Apparent Wind Direction
Direction from which the Wind appears to blow relative to a moving point (also
called Relative Wind Direction).
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AWS = Apparent Wind Speed
Speed at which the Wind appears to blow relative to a moving point (also
called Relative Wind Speed).
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Beacon
Prominent, specially constructed object forming a conspicuous vertical mark
as a fixed aid to navigation.
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Buoy
Floating object moored to the sea bottom in a particular (charted) place, as an
aid to navigation.
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Buoys and Beacons
Buoys and Beacons are used to indicate to mariners recommended or estab-
lished routes, underwater dangers, restrictions and regulations. They can be
lighted or not and are colored according to their international code.
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BRG = Bearing
Angle between the North (True or Magnetic) and a destination. The horizontal
direction of one terrestrial point from another referring to the North (True or
Magnetic). It is often used to indicate the direction to follow to reach the
destination.
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Chain (Loran-C GRI)
Groups of transmitting stations that use timed radio pulse transmissions. In
each of these chains there is a master station and two or more slave or sec-
ondary stations. Stations belonging to a same chain transmit pulses in timing
groups: a different time base identifies each chain. The time base of each
chain is the Group Repetition Interval or GRI. This GRI identifies the chain in
unique mode. For example the GRI = 4990 identifies the chain of Central
Pacific zone.
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COG = Course Over Ground
Direction of the path over ground actually followed by a vessel.
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Course Line (Time Line)
Graphical indication of the direction in which the Vessel is heading. The Course
Line origin is the vessel’s position so the time line movement is synchronized
with the vessels Icon. Course Line "course" is given by the value of COG