Version 2.0
203
Glossary
Operator’s Manual
GPS SYSTEM TIME
Time corrected to Universal Time Coordinated (UTC) and used as
the time standard by the user segment of the GPS system.
GREAT CIRCLE NAVIGATION
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 of Precision)
An indicator 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 of track with respect to
true north.
HEALTH
See SATELLITE HEALTH.
IEC
International Electro-technical Commission.
IMO
International Maritime Organization
Summary of Contents for MX420
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