Page 129 - Electronic Navigation Cyber Book

GLOSSARY

Almanac Satellite constellation information including location and health
data status.
The furthest point away from the earth reached by a satellite in
Apogee
orbit.
The direction vector drawn to a satellite from a fixed point on
Azimuth
earth.
BNM USCG Broadcast Notice to Navigators.
BPSK Bi-phase shift keying.
BRG Bearing.
C/A code Coarse/Acquire code. A PRN code operating at 1.023 Mbit s
-1
CEP Circular area probable. An accuracy figure achievable for 50%
of the time in two dimensions; latitude and longitude.
COG Course over ground.
CSOC Consolidated Space Operations Centre.
dB A unit for measuring power in a communications system.
DTK Desired track. The compass course between the start and
finish waypoints.
DGPS Differential GPS. A method to improve the accuracy of a GPS
fix by the use of
corrective data transmitted on medium frequency to coastal
shipping.
DMA US Defense Mapping Agency.
DoD US Department of Defense.
Dilution of Precision. A term used for expressing the
DOP mathematical quality of a solution. A circle around the true
position containing 95% of the fix calculations.
ECEF Earth-centered-earth-fix. A GPS fix solution is quoted in ECEF
co-ordinates.
EPE Estimated position error.
ETA Estimated time of arrival.
ETE Estimated time en route. The time remaining to a destination.
FAA US Federal Aviation Authority.

GDOP Geometric dilution of precision. A measure of the quality of a
solution.
Global Orbiting Navigation Satellite System. The Russian
GLONASS
Federation system.
GMT Greenwich mean time. Often referred to as Zulu.
GNSS Global Navigation Satellite System.
GPS Global Positioning System.
Ground The vessel's velocity referenced to the ocean floor.
speed

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