Definition of Terms •
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Definition of Terms
List of terms
APPROACHING POINT (AP)
A user selected point where a turning alarm is initiated.
AUTOMATIC RADAR PLOTTING AID (ARPA)
A system wherein radar targets are automatically acquired, tracked and collision situations computer assessed and
warning given.
CHANNEL LIMIT (CHL)
During route planning a channel limit is defined for each leg. This limit can also be the border line of the chart
shown on the radar display. "For more information, see "Figure 1" on page 418.
COURSE
The compass course = true course.
COURSE MADE GOOD (CMG)
The true filtered course which is calculated in the system. In case the course is taken from a magnetic compass the
value shown includes compensation and user stated deviation. "For more information, see "Figure 1" on page 418.
COURSE TO STEER (CTS)
Is the course to steer calculated by the system. "For more information, see "Figure 1" on page 418.
CLOSEST POINT OF APPROACH (CPA)
A user can set CPA limit.
DEADBAND WIDTH (DBW)
The dead band is an area within the channel where the system gives a zero cross track error value to the trackpilot.
"For more information, see "Figure 2" on page 418.
DATUM
A set of parameters specifying the reference surface or the reference co-ordinate systems used for geodetic control in
the calculation of co-ordinates of points on the earth. Commonly datum is defined as horizontal and vertical datum
separately. For the practical use of the datum it is necessary to have one or more well monument points with co-
ordinates given in that datum.
ELECTRONIC CHART DISPLAY AND INFORMATION SYSTEM (ECDIS)
The navigation information system which is considered equivalent to the nautical paper chart, displaying selected
information from the chart data base (see ENC) integrated with data from positional and, optionally other sensors.
By displaying chart contents and optionally other chart related and navigational information, ECDIS assists the
mariner in route planning and, with on-line position indication, in route monitoring.
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