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Glossary
REFERENCE COMPASS
REFERENCE ELLIPSOID
REFERENCE GPS MONITOR
RESET
RHUMB LINE
RHUMB LINE NAVIGATION
RMS
ROOT MEAN SQUARED (RMS)
Version 2.0
The compass against which the steering compass (see STEERING
COMPASS) may be calibrated.
A mathematical description of the Earth's ellipsoidal shape (see
ELLIPSOID), which is the reference frame for positioning computa-
tion.
A GPS CDU whose precise (surveyed) position is known. It com-
pares its own GPS position solution to the surveyed position and
generates correction values as a function of the position coordi-
nate differentials. The correction values are transmitted to user
GPS CDUs for use as corrections to their own GPS position solu-
tions.
To return stored values to either the default value or zero in memory.
The course of a vessel that keeps a constant compass direction,
drawn as a line on a chart or globe and cutting across all meridians
at the same angle. A rhumb line is a straight line on a Mercator
chart.
Navigation based on Rhumb Lines. See also GREAT CIRCLE NAVI-
GATION.
See ROOT MEAN SQUARED.
A statistical measure of probability, stating that an expected event
will happen 68% of the time. In terms of position update accuracy,
68 position updates out of 100 will be accurate to within specified
system accuracy.
Operator's Manual
209
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