Japan Radio Co. JLR-7900, Instruction Manual

Page: 9 / 184

vii
Terminology
Term Meaning
(Descriptions)
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.
Active route Route that is currently used by a ship
Anchor alert This alert monitors that the own ship is the preset distance or more
away from the waypoint.
Arrival alert This alert informs that the own ship has traveled the preset distance,
approaching the waypoint.
Beacon information Beacon data which is broadcast by message type 16.
CCRP Abbreviation of Consistent Common Reference Point. Reference
position of the own ship.
CDI Abbreviation of Course Deviation Indicator. This indicator shows
information on the deviation from the scheduled route and on the
direction into which the ship should be steered.
Checksum An error detection method to check that the data has been correctly
transmitted.
COG Course Over Ground.
Course Direction in which the ship is traveling, which is the bearing mainly
displayed by the GPS.
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.
FRAM Nonvolatile memory using a ferroelectric substance.
Geodetic Conditions for expressing position via latitude and longitude.
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.
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.
IEC IEC is the abbreviation of International Electrotechnical
Commission. It is an international standard governing electrical
and electronic technologies.
IPXX IPXX is
Degrees of protection provided by enclosures (IP Code)
1st numeral: Against ingress of solid foreign objects (0 – 6)
2nd numeral: Against ingress of water with harmful effects
(0 - 8).
(IPX4: splash-proof, IPX6: waterproof)
LCD Unit (LCD) Liquid Crystal Display Unit.
Log Pulse Contact output signal, output pulse per nm.
Expressed in units of "p/nm". mi/h Unit of ship speed.
display Method for expressing the present position with loran system time