Appendix 3 Terminology - JRC JLR-21 Instruction Manual

Appendix 3 Terminology

Term
2D (2 dimension)
3D (3 dimension)
AD-10
ARPA
ANCHOR WATCH
Bow Heading
CCRP
Checksum
COG
CURRENT
DISP-DPU
DGPS
DR
FRAM
Geodetic
GPS Repecon
GPS Satellite (GPS)
HDG
HDOP
Meaning
Positioning with antenna elevation height in addition to satellite data.
The three dimensional position fix, 4 or more satellites required.
Transmission method for handling bow heading data.
Automatic Radar Plotting Aids, equipment for automatic collision
avoidance.
Function for monitoring a shift in position while the ship is at anchor.
Angle between the ship's bow and meridian.
Abbreviation of Consistent Common Reference Point.
A common reference point for controlling a ship is defined so that
all the measurements including the range, the bearing, the relative
course, and the velocity to the target can be measured on the basis
of CCRP.
(Only CCRP settings are allowed in this device. Conversion of
measured values to the CCRP reference point is not available.)
An error detection method to check that the data has been correctly
transmitted.
Course Over Ground.
Sea and ocean currents, expressed in speed and direction.
The main circuitry of display unit.
Abbreviation of Differential Global Positioning System. GPS satellite
error data sent from a reference station whose position is accurately
known is received via beacon from a beacon station, improving
positioning accuracy.
Abbreviation of Dead Reckoning. Reckoning of course and distance
with the aid of Gyro and ship's speed.
Nonvolatile memory using a ferroelectric substance.
Conditions for expressing position via latitude and longitude.
Device for synchro / step conversion of true bearing signal output by
GPS compass.
Abbreviation of Global Positioning System. Refers to satellites
launched for navigational support of military vessels managed by the
United States Department of Defense.
Abbreviation of Heading, indicating heading of ship's bow.
Abbreviation of Horizontal Dilution of Precision. Indicates accuracy
of positioning. The smaller the number, the higher the accuracy. If
GPS satellites are unevenly distributed, this number will grow. If
GPS satellites are evenly distributed, this number will be smaller.
Appendix 3-1