Leica MX400 Operating Instructions Manual page 224

Glossary
One of 24 longitudinal segments around the world, each
generally 15 degrees and 1 hour wide. Please check locally for
the exact time zone offset relative to UTC (see below).
TRACK
In routes: The course lines between the waypoints.
In the plotter: The line showing the past movements of the
vessel.
TRANSDUCER
A device that transfers power from one system to another in the
same or in different form. See also SENSOR.
TRIP LOG
In the navigator, an easy resetable sum log that accumulates the
distance sailed over ground based on the GPS signals. See also
GPS LOG
TRUE HEADING
Direction in relation to true north. True heading is compass
heading corrected for MAGNETIC DEVIATION and VARIA-
TION. The true heading used by the navigator for navigation
calculations is a composite of magnetic heading input from the
NMEA compass, magnetic variation as calculated by the
navigator, the values entered into the compass deviation table.
TRUE NORTH
Direction along the meridian of the observer to the north pole.
TRUE WIND ANGLE (TWA)
Similar to APPARENT WIND ANGLE, but compensated for
the motion of the vessel. TWA and AWA are equal if the vessel
is not moving.
TRUE WIND DIRECTION (TWD)
The direction of the wind over ground, expressed as an angular
Version 3.3
Operator's Manual
211