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115 User Manual
world-wide. This function can calculate the tide heights for any past or future date and as a by-product
of this calculation will also display the Maximum and Minimum Tide height and time for the day
selected plus the times of Sunrise and Sunset. At some chart levels, the chartplotter will display a new
Tide Diamond Symbol for every Port or tide point in the database covered by that particular C-CARD
(see Par. 3.4.4).
Time Line
The location where the ship will be after the time set by the user.
Track
As long as the chartplotter is connected to a positioning instrument, it stores all points in its memory.
The chartplotter can store a fix when the distance from its last stored position is greater than a defined
distance or after a defined time. A line connects such points and represents the past course, called the
Track of the ship (see Par. 4.4).
Tracks & Routes
Recommended and established routes for ships at sea, including traffic separation schemes, deep water
routes, ....
TRN = Turning
The difference between COG and BRG. If COG is 80° and BRG is 75°, TRN is 5° Left.
TTG = Time To Go
The estimated time needed to reach your destination, based on your current speed and the distance to
destination.
TWA = True Wind Angle
Direction of the air relative to fixed point on the heart.
TWS = True Wind Speed
Speed of the air relative to fixed point on the heart.
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
A 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.
VRM = Variable Range Marker
Circle with radius set by the user and center as cursor position.
VDOP = Vertical Dilution Of Precision
It is the index for position-fixing accuracy.
VMG = Velocity May Good
The Velocity May Good is the component of the velocity that is in the direction of the destination.
WAAS = Wide Area Augumentation 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 redun-
dancy and reduce operational restrictions.