Table of Contents
Advertisement
Glossary
Version 7.5
Operator's Manual
GMT
Greenwich Mean Time. See also UNIVERSAL TIME COORDI-
NATED.
GPSLOG
A feature ofthe navigator that measures the sailed distance based
on the GPS signals rather than a water distance sensor.
GPS SYSTEM TIME
Time corrected to Universal Time Coordinated (UTC) and used as
the time standard by the user segment of the GPS system.
GREATCIRCLE NAVIGAnON
Navigation based on a Great Circle calculation. The advantage of
Great Circle navigation is that it brings you the shortest way through
the active route. The disadvantage is that a Great Circle track may
differ from the straight rhumb line that is easily drawn on a Mercator
projected chart. Great Circle navigation is recommended for ocean
voyages only. The advantage increases by higher latitude (north
or south).
HDOP (Horizontal Dilution ofPreeision)
An indieator of the two dimensional accuracy in position (latitude
and longitude). See DILUTION OF PRECISION.
HEADING
The direction in which the vessel is pointed, expressed as angular
distance from north clockwise through 360 degrees. HEADING
should not be confused with COURSE The HEADING is con-
stantly changing as the vessel yaws back and forth across the
course due.to the effects of sea, wind, and steering error.
HEADING-TO-STEER
The angle of track required to steer the vessel or vehicle from its
present position to its planned destination point. This angle dif-
fers from heading, which is its present angle oftrack with respect to
true north.
HEALTH
See SATELLITE HEAL
ra
205
Advertisement
Table of Contents
