The CM-93 database is intended for
use on advanced electronic charting and navigation
systems. It has been developed specifically to meet
international electronic charting standards. The database
is S57/3 compliant and designed specifically for Electronic
Chart Display and Information Systems (ECDIS), which
satisfy International Maritime Organization performance
The database is seamless and where
applicable, charts have been converted to a common
datum (WGS84). The database incorporates the standard
S57 object catalog of 205 objects and 12 catalogs.
Since the database is generated from paper charts,
every chart cell is referenced to the original chart.
The worldwide chart database is
available on an annual subscription basis supplied
on a single CD-ROM. Alternatively, it can be purchased
outright, without annual updates. It is divided into
nine overlapping zones, with each zone also divided
into a number of areas. The database can be purchased
in its entirety, by zone or by area.
The C-MAP chart database is continuously
updated based on official Notice to Mariners
publications. In addition, new charts are incorporated
in the database on a priority list, which reflects
specific requests from users and manufacturers. Updated
CDs are produced and distributed to annual subscribers
three times per year, while hourly updates can be
downloaded at any time via an Internet or RAS connection.