TERMS AND ABBREVIATIONS
20221859 / F 135
13 TERMS AND ABBREVIATIONS
AIS Automatic Identification System. System where vessel information (location,
course, speed, etc.) is broadcast by VHF radio, for use by other vessels in
navigation and collision avoidance.
APIS Automatic Passenger Information System
ARPA Automatic Radar Plotting Aid
ASCII American Standard Code for Information Interchange. Numerical representation
of characters.
ATON Aids To Navigation
BAS Base (Chart display button)
BTW Bearing To Waypoint. Bearing to a specified waypoint from present position. The
correct acronym for the more commonly used BPW (Bearing Position Waypoint).
CalcSPD Speed used for ETA calculation
CD Compact Disc
CIE Comité International de l'Eclairage
COG Course Over Ground. The actual direction of progress of a vessel, between two
points, with respect to the surface of the earth. The vessel’s heading may differ
from the course over ground due to the effects of wind, tide and currents.
COP Operating Panel for the Simrad Common Operator Station
CPA Distance in Nautical miles to Closest Point of Approach for the ARPA target
CS Chart System
CUS Custom (Chart display button)
DR Dead-reckoned
DTA Distance to last waypoint
DTM NMEA0183 message containing Datum reference
DVD Digital Versatile Disc
DVI Digital Visual Interface
DWO Distance to wheel over point
EBL Electronic Bearing Line
ECDIS Electronic Chart Display and Information System, type approved ECS system
according the ECDIS regulations.
ECS Electronic Chart System, for advanced navigation steering with preset radius in
routes of waypoints
ENC Electronic Navigational Chart
EP Estimated Position
EPFS Electronic position-fixing system
ETA Estimated Time of Arrival
EUT Equipment under test
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