Raytheon Pathfinder ECDIS Operator's Manual page 67

2.9.1.1 S57/3 (C−MAP93/3), IHO S−63
The CM93/3 Database is a seamless product. It consist of different scale layers,
corresponding to as many navigational purposes of S57/3; each layer includes
electronic charts with similar compilation scale, organized into a continuous
coverage.
The following scale layers are defined:
CM93/3 navigational purpose
background, large scale (*)
background, small scale (*)
overview
general
coastal
approach
harbor
berthing
(*) These navigational purposes are extensions to S57/3.
Where an overlapping between two charts into the same scale layer occurs, this
is resolved giving priority to one chart, according to the following criteria:
If an ENC (Electronic Navigational Chart) data set overlaps a non−ENC data
set, the ENC data set takes precedence.
If two ENC data sets overlap, the one that was issued first takes precedence.
The other data set may remain included in the CM93/3
Database, but it is no longer regarded as an ENC, since it violates one of the
fundamental principles of S57/3 (i.e. the exclusivity of data).
Edition: 30.MAR.2007
ECDIS
Operator Manual
Corresponding CM93/2 scale level
2−37
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