Interphase Chart Master Chart Master 11 CVS+ User Manual page 57

7
. Terms
ALT = Altitude
Altitude of GPS Antenna on the medium sea level.
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.
Arrival Time
The estimated time of day you will reach your destination, based on your
current Speed and Track from GPS.
ASF = Additional Secondary phase Factor (TD Coordinates System)
Correction to TD values which can be inserted by the user.
Azimuth
The angular measurement from the horizon to a satellite or another object.
AWD = Apparent Wind Direction
The Direction from which the Wind appears to blow relative to a moving point
(also called Relative Wind Direction).
AWS = Apparent Wind Speed
The Speed at which the Wind appears to blow relative to a moving point (also
called Relative Wind Speed).
Beacon
A prominent, specially constructed object forming a conspicuous vertical mark
as a fixed aid to navigation.
Buoy
A floating object moored to the sea bottom in a particular (charted) place, as
an aid to navigation.
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.
BRG = Bearing
It is the 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 Mag-
netic). It is often used to indicate the direction to follow to reach the destination.
Chain (Loran-C GRI)
The Loran chains are 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 secondary 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.
COG = Course Over Ground
Direction of the path over ground actually followed by a vessel.
CTS = Course To Steer
The optimum direction the boat should be steered in order to efficiently make
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