Si-tex SNS-1100, User Manual, Page: 86 / 114

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- User Manual
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 solutions can be used.
• Arrival Time
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
Angular measurement from the horizon to a satellite or another object.
• AWD = Apparent Wind Direction
Direction from which the Wind appears to blow relative to a moving point (also called Relative
Wind Direction).
• AWS = Apparent Wind Speed
Speed at which the Wind appears to blow relative to a moving point (also called Relative Wind
Speed).
• Beacon
Prominent, specially constructed object forming a conspicuous vertical mark as a fixed aid to
navigation.
• Buoy
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 established routes,
underwater dangers, restrictions and regulations. They can be lighted or not and are colored
according to their international code.
• 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.
• 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 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.
• 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 (Course Over Ground) and its length is
proportional to the SOG (Speed Over Ground).
• CTS = Course To Steer
Optimum direction the boat should be steered in order to efficiently make headway back to
the courseline while also proceeding toward the destination Waypoint.