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User Manual
Time Line
The location where the ship will be after the time set by the user.
Tracks & Routes
Recommended and established routes for ships at sea, including traffic separation schemes, deep water routes,
....
TRN = Turning
Difference between COG and BRG. If COG is 80° and BRG is 75°, TRN is 5° Left.
TTG = Time To Go
Estimated time needed to reach your destination, based on your current speed and the distance to destina-
tion.
User Point
Place on the chart identified by its coordinates and displayed on the screen with a reference symbol (see
Mark, Waypoint and Event).
UTC = Universal Time Coordinated
Time scale based on the rotation of the earth that is used by most broadcast time services.
UTM = Universal Transverse Mercator
Metric Grid system used on most large and intermediate scale land topographic charts and maps.
VAD = Value Added Data
The Value Added Data (VAD) is a collection of additional cartographic objects which are not present on the
original paper chart (from which the electronic chart derives). These objects have been obtained from other
sources (that C-MAP believes to be reliable) and then merged to the electronic charts in order to provide
more information useful for the navigation. VAD object can be any cartographic objects and it can be
distinguished from the official-chart-objects from the Quick Info. A dedicated icon is shown on the Quick
Info window to indicate that the object queried is a VAD. The same icon is also shown on the Full Info page
and in addition the extended text Value Added Data is shown on the details of the VAD object.
VMG = Velocity Made Good
Destination closing Velocity. The VMG is calculated using the current speed of the vessel (SOG) and the
difference between the current vessel course and the bearing to the destination.
WAAS = Wide Area Augmentation System
The Federal Aviation Administration (FAA), in cooperation with other DOT organizations and DOD, is
augmenting the GPS/SPS with a satellite-based augmentation system, the WAAS. It will provide a signal-in-
space to WAAS users to support en route through precision approach navigation. After achieving initial
operational capability, the WAAS will then be incrementally improved over the next years to expand the area
of coverage, increase the availability of precision approaches, increase signal redundancy and reduce opera-
tional restrictions.
Waypoint
Any point to which one intends to navigate. A sequence of Waypoints makes up a Route plan .
WGS-84 = World Geodetic System 1984
Coordinates System or Datum developed by the Defense Mapping Agency (DMA).
Zoom-In
Shows more detail in a smaller area.
Zoom-Out
Operates similarly to zoom -in, but in the reverse, showing a wider but less detailed view.
XTE = Cross Track Error
The distance from the ship's present position to the closest point on a line between the origin and destina-
tions Waypoints of the navigation leg being travelled.
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