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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 destination.
TWD = True Wind Direction
Direction of the Wind relative to a fixed point on the earth.
TWS = True Wind Speed
Velocity of the Wind relative to a fixed point on the earth.
Underwater Objects
Objects like obstruction, wreck, cable…
User Point
Object you place on the chart identified by its coordinates and displayed on
the screen with a reference symbol (see Mark, Waypoint).
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.
Variation
Angle between the magnetic and geographic meridians at any place,
expressed in degrees West or East to indicate the direction of magnetic
North from true North. It changes from point to point, and (at the same
point) with time.
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 operational 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). It is the default geodetic Datum used by the chartplotter and the GPS.
Terms