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Glossary
Version 7.5
Operator's Manual
RANGE RESIDUAL
The difference between the expected satellite range and the mea-
sured satellite range for the last measurement taken from each sat-
ellite in the constellation.
RATDMA
Random Access Time Division Multiple Access - Access
protocol for transmissions which have not been pre-announced.
This is used for the first transmission during data link network
entry or for messages of non-repeatable character.
REFERENCE COMPASS
The compass against which the steering compass (see STEERING
COMPASS) may be calibrated.
REFERENCE ELLIPSOID
A mathematical description of the Earth's ellipsoidal shape (see
ELLIPSOID), which is the reference frame for positioning computa-
tion.
REFERENCE GPS MONITOR
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.
RESET'
To return stored values to either the default value or zero in memory.
RHUMB LINE
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.
RHUMB LINENAVIGATION
Navigationbased on Rhumb Lines. See also GREAT CIRCLE NAVI-
GATION.
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