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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
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
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-M A P,
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, relative speed, CPA or TCPA are referenced, typically the
conning position of the bridge.
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