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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