xli
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.