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U sers should be aware that, depending on the manufacturer, each type of ECDIS manages the import of ENCs in one of two ways:

1.    The ECDIS loads the ENC base data (base celi) in the first instance and then the user has to update as a separate operation;

2.    The ECDIS will manage the import of ENC base data and all updates in a single operation.

Users should consult the ECDIS User Guide supplied with the eąuipment to confirm which operation is appropriate to the system.

The appropriate base discs must be installed in the system and licensed ENCs imported according to the instruction provided in the ECDIS User Guide. The process must be repeated until all licensed ENCs are imported to the system.

Step 3: Installing AVCS ENC Updates

AVCS is updated on a weekly basis and updates are distributed via your Admiralty Chart Agent on CD-ROM. The only exception to this is in a week when the AVCS Base Discs are re-issued; in these instances an AVCS Update CD will not be issued.The AVCS Update CD contains all new ENCs, new editions of ENCs and ENC updates issued sińce the last set of AVCS Base discs were issued. The CD is cumulative so the user only has to load the latest week number. Users can update their system using the AVCS Update CD or remotely over the internet using the Admiralty Updating Sen/ice or Admiralty e-Navigator Planning Station.

NOTĘ: Although ECDIS eąuipment and ENCs are designed to be very reliable, there is a slightly increased risk of problems occurring when ENCs are being added, removed or updated. For this reason, you must not attempt to make changes to the installed AVCS ENCs when the eąuipment is being used for primary navigation or if the vessel is committed to an imminent departure.

Step 4: Maintaining AVCS ENC Holdings

Your Admiralty Chart Agent will provide you with a weekly Update CD, when it is practical to do so. The AVCS Base discs are re-issued about every 8 weeks depending on the amount of data on the Update CD. It is important that users do not attempt to load an Update CD that is not consistent with the Base discs. For example, you should not attempt to load an update that is older than the Base discs held on board and installed on the ECDIS.

Notę: When new AVCS Base discs are re-issued the user MUST install these before attempting to load the latest AVCS Update CD.

Periodically the user will be supplied with an updated set of AVCS ENC Permits. New permits are issued for any ENC that has had morę than one new edition. The reason for this is that older ECDIS will only install ENCs with the same edition number as contained in the permit.

An AVCS permit file is specific to a particular week as described in the Schedule A. It is important that users do not install these unless they have the corresponding Update CD for the same week. Faiłure to follow this advice when using an ECDIS type-approved before 1 January 2009 could render some of the installed ENC unavailable for use in the ECDIS. The only exception to this rufę is if additional coverage is reąuired in case of emergency or a change to a planned route.

AVCS ENC updates are also available over the Internet using the Admiralty Updating Sen/ice or Admiralty e-Navigator Planning Station.

Emergency AVCS ENC Permits

Under certain circumstances it may be necessary for a vessel to gain access to an unlicensed AVCS ENC at very short notice. For instance if the vessel has to divert from a planned route due to a medical or safety related emergency. In these emergency situations only, indMdual AVCS ENC Permits can be obtalned from the UKHO 24 hours a day, 365 days a year. These permits can be transmitted direct to the vessel by email, by fax, or simply by reading the AVCS permit string(s) out over the telephone or radio. This sen/ice is also available for the ECDIS and ARCS services.

To obtain an AVCS emergency chart permit please contact UKHO Customer Services. quoting your name and contact details, the vessel name, the User Permit Number of your ECDIS system and the ENC(s) reguired.