User Manual
Reference number: 4111A-RADAR4600-GBD-R1.1
Date: 27 February 2018
Page 148 of 149
(or equivalent) and water speed log input as
reference.
SOLAS
an International Convention for the Safety of
Life at Sea.
speed over ground
SOG
the speed of the ship relative to the earth,
measured on board of the ship.
speed through water
STW
the speed of the ship relative to the water
surface.
standard display
the level of information that shall be shown
when a chart is first displayed on ECDIS or ECS.
The level of the information it provides for
route planning or route monitoring may be
modified by the mariner according to the
mariner's needs.
standard radar reflector
a reference reflector mounted 3.5 m above sea
level with 10 m
2
effective reflecting area at X
Band.
steady state tracking
the tracking of a target, proceeding at steady
motion:
– after completion of the acquisition process, or
– without a manoeuvre of target or own ship, or
– without target swap or any disturbance.
stern line
a graphic line drawn from the consistent
reference point to the bearing scale, on a
reciprocal bearing to the heading line..
target swap
a situation in which the incoming radar data for
a tracked target becomes incorrectly associated
with another tracked target or a non tracked
radar echo.
target’s predicted motion
the prediction of a target’s future course and
speed based on its present motion as
determined by past measurements of its range
and bearing on the radar.
target tracking / TT
a computer process of observing the sequential
changes in the position of a radar target in
order to establish its motion. Such a target is a
Tracked Target (TT).
task at hand
the specific activity being performed by the
user, for example collision avoidance, route
planning,
route
monitoring,
,grounding
avoidance.
test target
a radar target of known characteristics used for
a test requirement.
trails
tracks displayed by the radar echoes of targets
in the form of an afterglow. Trails may be true
or relative. Relative trails are as they would be
presented in relative motion. True trails are as
they would be presented in true motion.
trial manoeuvre
a graphical simulation facility used to assist the
operator to perform a proposed manoeuvre for
navigation and collision avoidance purposes, by
displaying the predicted future status of at
least all acquired or activated targets as a result
of own ship’s simulated manoeuvres.
true bearing
the direction of a target from own ship’s CCRP
or from another target’s position, expressed as
an angular displacement from true north.
true course
the direction of motion relative to ground or to
sea, of a target expressed as an angular
displacement from north.
true motion / TM
a display across which own ship moves with its
own true motion. It is the combination of true
course and true speed.
true speed
the speed of a target relative to ground, or to
sea.
true vector
a vector representing the predicted true motion
of a target, showing course and speed with
reference to the ground or sea.
user configured presentation
a display presentation configured by the user
for a specific task at hand. The presentation
may include radar and/or chart information, in
combination with other navigation or ship
related data.
