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Glossary
AIO : Admiralty Information Overlay. AIO is a digital dataset that is designed to
provide additional information to the navigation published by United Kingdom
Hydrographic Office (UKHO).
AIS : Automatic Identification System
AOC : Analog Option Circuit(Option interface board in Junction Box)
ARCS : Admiralty Raster Chart Service. A raster chart published by UKHO
ARPA : Automatic Radar Plotting Aid
AUTO SAIL : The system automatically navigates to keep the scheduled route. Same as
automatic sailing.
AZ : Acquisition/Activation zone
Anti-clutter rain : Rain/snow clutter suppression
Anti-clutter sea : Sea clutter suppression
AZI : AZImuth stabilization mode
Base CD : Chart CD containing a complete chart data
BCR/BCT : Bow Crossing Range/Bow Crossing Time
CCU : Central Control Unit
Cell Permit : A file containing an encryption key for S-63 chart. Supplied by UKHO,
PRIMAR STAVANGER, and Hydrographic and Oceanographic Department of
Japan Coast Guard.
Chart Maintenance : Software to manage the charts. Imports and updates the charts.
C-MAP Ed.3 : C-MAP Edition 3. A digital chart format by Jeppesen (formerly, C-MAP,
Norway)
C-MAP : Digital chart data by Jeppesen (formerly, C-MAP, Norway)
CTS : Course To Steer. Heading command.
COG : Course Over the Ground
C up : Course up. Own ship’s course is pointed to the top center of the radar display.
CCRP : Consistent Common Reference Point. The own ship position, to which all
horizontal measurements such as target range, bearing, relative course,
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