Ecdis Glossary


ECDIS - Electronic Chart Display and Information System
 
EC - Electronic Chart        
                                                             
ENC - Electronic Navigational Chart 
                                                                                    
GPS - Global Positioning System
 
AIS - Automatic Identification System                                              

ARPA - Automatic Radar Plotting Aid                                                   

COG - Course Over Ground
 
The GPS system’s calculation of the ship’s heading in relation to the installed chart system
 
DGPS - Differential Global Positioning System
 
An enhancement to GPS that uses a network of fixed, ground-based reference stations to broadcast the difference between the positions indicated by the satellite system and the known fixed positions
 
DNC - Digital Nautical Charts
 
A vector-based digital product designed to give navigators an up-to-date seamless database of the world. DNCs are published by the National Geospatial-Intelligence Agency
 
EBL - Electronic Bearing Line
 
A feature in a radar that is used to determine the relative bearing of an object from the observing ship’s bearing
                                                    
HDT - Heading True
 
Used to send heading information from the gyro-compass to other devices including radar and ECDIS
 
IBS - Integrated Bridge System       
                                                                                   
RENC - Regional ENC Coordination Centre
 
RENC validates and distributes ENCs from producing nations to end-users. Only two currently exist, PRIMAR in Norway and IC-ENC in the UK
 
RNC - Raster Nautical Chart        
                                                         
SENC - System Electronic Navigational Chart        
                               
SOG - Speed Over Ground
 
The GPS system’s approximation of the ship’s speed in relation to the installed chart
 
TCS - Track Control System    
                                                              
Via a connection with the autopilot, TCS in an ECDIS controls that the ship’s GPS position follows a pre-planned track
 
TTM - Tracked Target Status  
                                                              
Used to send tracked target information from ARPA to ECDIS
 
VDR - Voyage Data Recorder    
                                                           
VRM - Variable Range Marker   
                                                          
A feature of radar used to determine relative distance to any target seen on the screen
 
VTS - Vessel Traffic Services   
                                                           
WEND - Worldwide Electronic Navigational Chart Data Base 
              
An IHO concept, based on the set of WEND Principles, designed specifically to ensure a world-wide consistent level of high-quality, updated official ENCs through integrated services that support chart carriage requirements of SOLAS and the requirements of IMO PS for ECDIS

 


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