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An information window on the screen with correction information about the current electronic chart
When new corrections are entered in an ECDIS there is an automatic control function to check that earlier corrections have been entered. If a correction is missing then ECDIS: will raise an alarm and it will not be possible to continue until the missing correction has been entered.
When ROCKNES went aground 040119 in Vatlestraumen in Norway, the pilot and the captain were both familiar with the waters but they were using unofficial electronic charts. A new paper chart, corrected in February 2003, was available on board, but it was not consulted. The official electronic chart (for ECDIS) that had been issued at the time was also corrected for the shoal.Unofficial electronic charts have varying periods between corrections. The corrections are carried out by exchanging the old memory card for a new one, which is supplied at a discount.
1.1. Manual corrections
Manual corrections can be carried out on ENC s using information from NtM.
Correction log (Adveto) Menus for manual corrections. A log of manual corrections can also be accessed
Single objects that have been removed crossed out by
Line features that have been removed are crossed out and when added marked by a series of small red circles
Added areas are marked by small red rings and
General electronic chart functions
he small displayed area of an electronic chart on a monitor, as compared to a paper chart, requires the Navigator to move (pan) the chart picture, for example to view conditions some distance ahead of the vessel, or to increase the legibility of details (zoom).
2. Changing scale
Coastal navigation, particularly in restricted waters, may require frequent scale changes.
The ECDIS standard permits the inclusion of nautical information from for example Pilot books, to be included in the system as additional layers, but the flag state must approve the use.
AIO, Admiralty Information Overlay, is another way to include the presentation of more information by ENCs. AIO includes all UKHO Temporary and Preliminary Notices to Mariners and other news items that have not yet been issued as corrections. More information about AIO can be found on the UKHO website: www.ukho.gov.uk The Admiralty e-navigational Planning Station can show all the UKHO digital publications as overlays on their electronic charts, (AVCS and ARCS).
Admiralty Total Tide as an overlay