Jeppesen Marine Workboat Navigator 1.3 - Manual (Page 154)

Jeppesen Workboat Navigator User’s Guide
146
Glossary
Active (route, mark, etc.)
An active route or mark is that from
which various data, such as ETA, range
and bearing are calculated with respect
to the boat.
Aids to Navigation
Usually pertains to buoys, daymarks,
ranges, and the like.
Air Draft
The maximum height of a boat.
AIS
See Automatic Identification System.
ARPA
See Automatic Radar Plotting Aid.
Annotation
A navigation object composed entirely of
text. Its purpose is to place descriptions
or other information on specific areas of
a chart.
Automatic Identification System (AIS)
AIS provides a means of broadcasting
digitally navigation information
including boat position/speed/heading/
dimension/name/destination/ROT, aids
to navigation, base station reports,
and more. Created by the IMO and
sanctioned by the U.S. Coast Guard for
boat monitoring and collision avoidance.
It is used by boat traffic monitoring and
control locations throughout the world to
improve situational awareness and help
prevent collisions at sea.
Automatic Radar Plotting Aid (ARPA)
The functionality entailing the detection
of moving targets and calculating their
speed and course. ARPA is a collision
avoidance system.
AutoScroll
This feature allows you to more easily
create routes and boundaries which
exceed the parameters of the view
window. As you come to the edge of the
view window while creating or dragging
objects, the chart will scroll automatically
in the proper direction.
Bearing (BRG)
The angle between the direction of
the boat and the reference direction
expressed in degrees, with a notation of
True or Magnetic Variation (T or M). Due
north corresponds to 0 degrees, east
to 90, south to 180, and west to 270.
For compass bearings, the reference
direction is magnetic North. For true
bearings the reference direction is true
North.
Bearing to Cursor
This data is an aid in route making and
planning. Bearing to cursor is expressed
in degrees, with a notation of True or
Magnetic Variation.
Boat Speed
The speed of the boat relative to the
water.
Boundary
A line created by the user. Jeppesen
Workboat Navigator can be configured
so that when the boat or its predictor
line crosses a boundary, an alarm will be
triggered.
Broadcast Notice to Mariner (BNM)
See Local Notice to Mariners (LNM).
Chart
Nautical term for maps used in nautical
navigation that show the depth of waters
as well as land boundaries and other
obstructions. Charts may be paper or
electronic, and electronic charts may be
of raster or vector type.
Closest Point of Approach (CPA)
Predicted closest point a maneuvering
boat will get relative to any target, moving
or otherwise., located at a point on the
relative movement line perpendicular
to the reference boat. The minimum
horizontal distance between two craft
during a close proximity encounter.
COG
See Course Over Ground.
COM Port
The interface through which Jeppesen
Marine Workboat Navigator and your
computer can communicate with
peripherals.
Glossary