Page 99 - Electronic Navigation Cyber Book

charts. Seafarer is updated monthly on a similar basis. ARCS has near
worldwide coverage with 2700 charts available on CD-ROM.

ADMIRALTY Vector Chart Service (AVCS)
The ADMIRALTY Vector Chart Service (AVCS) is the world’s leading
digital maritime chart service, with over 14,750 official Electronic
Navigational Charts (ENCs) to help bridge crews navigate safely and
efficiently whilst meeting Flag and Port State requirements.

Digital Chart Data Transfer
The IMO, in its performance standards for ECDIS, has mandated that
individual national hydrographic offices will supply official ENC data for
ECDIS use. A preliminary data transfer standard, known as DX 90, has
been proposed within the IHO; IHO is debating the utility of this standard.
Regardless of the transfer standard recommended, each national
hydrographic office that produces a data base will decide what transfer
standard it will use.

To ensure the reliability of the data, the ECDIS must not allow data from
an unofficial source to erase, overwrite, or modify HO supplied data.

ECDIS Warnings And Alarms
Since the ECDIS is a “smart” system which combines several different
functions into one computerized system, it is possible to program it to
sound alarms or display warnings when certain parameters are met or
exceeded. This helps the navigator to monitor close navigation hazards.

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