Si-text trawl plot 12, User Manual, Page: 109 / 118

111 User Manual
C
Terms
This section explains the terms that may be unfamiliar to the reader.
Arrival Time
The estimated time of day you will reach your destination, based on your current speed and track from
GPS.
Attention Areas
Attention Areas are areas in which special attention by the mariner is required, because of natural or
man-made hazards, or sailing regulations and restrictions. Moreover a special symbol (!) is placed inside
the area selecting On option. This is valid also for the categories: FISHING FACILITY, MARINE
FARM/CULTURE, MILITARY PRACTICE AREA, RESTRICTED AREA, SEAPLANE LAND-
ING AREA. When the area is small, it is identified only by the boundary.
AWA = Apparent Wind Angle
Direction of the air relative to the moving ship.
AWS = Apparent Wind Speed
Speed ot the air relative to the moving ship.
Azimuth
The angular measurement from the horizon to a satellite or another object.
Beacon
A prominent, specially constructed object forming a conspicuous vertical mark as a fixed aid to navigation.
BRG = Bearing
It is the angle between the North (True or Magnetic) and a destination. It represents the direction to
follow.
Buoy
A floating object moored to the sea bottom in a particular (charted) place, as an aid to navigation.
Chain
Selects the preferred chain. 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.