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.
ARGUS
Simrad professional X-band radar.
ARPA
Automatic Radar Plotting Aid.
ATON
Aids To Navigation.
BTW
Bearing To Waypoint. Bearing to a specified waypoint from present position. The correct
acronym for the more commonly used BPW (Bearing Position Waypoint).
BWOL
Bearing from the current position to the next wheel-over line.
CAN bus
Controller Area Network, a bus standard designed to allow microcontrollers and devices to
communicate with each other.
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.
Chart permit code
Code required to install charts on the system. The code is generated by the chart supplier
when they have received the User permit code.
CPA
Distance in Nautical miles to Closest Point of Approach for the ARPA target.
CPR
Common Reference Point.
CPU
Central Processor Unit.
DR
Dead Reckoning.
DTA
Distance from the current position to last waypoint in the route.
DWOL
Distance from the current position to the next wheel-over line.
EBL
Electronic Bearing Line.
ECDIS
Electronic Chart Display and Information System, type approved ECS system according the
ECDIS regulations.
ENC
Electronic Navigational Chart. An official database created by a national hydrographic office
for use with an Electronic Chart Display and Information System (ECDIS).
EP
Estimated Position.
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Terms and abbreviations| E50xx ECDIS Operator Manual
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