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Sea state : Status of the sea condition due to the weather environment, expressed
as a sea state 0 for flat conditions with minimal wind, to sea state 8 for
very rough sea conditions.
Ship-avoiding operation : To operate the ship in order to avoid obstacles during automatic
navigation, regardless of the scheduled route
Sleeping AIS target : A target indicating the presence and orientation of a vessel equipped
with AIS
Spot depth : Numeric representation of depth
SSR: Solid State Radar : Radar that uses semiconductor elements instead of magnetron, which
requires periodic replacement. It is built with a system that ensures
necessary detection capability even when a transmission output is low,
by using chirp signals with a long pulse length upon transmission and
performing pulse compression upon reception
Update (Chart Maintenance) : A procedure of reflecting the update data supplied by Update CD on
the imported chart.
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