Appendix 3-1
Appendix 3 Terminology
Term
Meaning
2D (2 dimension) Positioning with antenna elevation height in addition to satellite data.
3D (3 dimension) The three dimensional position fix, 4 or more satellites required.
AD-10 Transmission method for handling bow heading data.
ARPA Automatic Radar Plotting Aids, equipment for automatic collision
avoidance.
ANCHOR WATCH Function for monitoring a shift in position while the ship is at anchor.
Bow Heading Angle between the ship’s bow and meridian.
CCRP 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.)
Checksum An error detection method to check that the data has been correctly
transmitted.
COG Course Over Ground.
CURRENT Sea and ocean currents, expressed in speed and direction.
DISP-DPU The main circuitry of display unit.
DGPS 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.
DR Abbreviation of Dead Reckoning. Reckoning of course and distance
with the aid of Gyro and ship’s speed.
FRAM Nonvolatile memory using a ferroelectric substance.
Geodetic Conditions for expressing position via latitude and longitude.
GPS Repecon Device for synchro / step conversion of true bearing signal output by
GPS compass.
GPS Satellite (GPS) Abbreviation of Global Positioning System. Refers to satellites
launched for navigational support of military vessels managed by the
United States Department of Defense.
HDG Abbreviation of Heading, indicating heading of ship's bow.
HDOP 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.
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