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128 · Vector Chart material
A little learning about date dependency of S57 standard
How the issue date of updates change the visibility of the changes
Study the example below to understand the behaviour of updates relative to date
Figure above shows how updates are dependent on Display/Approve date set by user. Actions from 1 to 4 are
follows:
1. Base cell including three updates is converted into SENC. Display date is set as current date
of the System. Approve date has to set current date.
2. The date in which update 1 was issued. Display and Approve dates have to set to correct date
in order to see the chart with Update 1.
3. The date in which update 2 was issued. Display and Approve dates have to set to correct date
in order to see the chart with Update 1 and Update 2.
4. The date in which update 3 was issued. Display and Approve dates have to set to correct date
in order to see the chart with Update 1, Update 2 and Update 3.
NOTE! In order to display charts with correct updated situation, use always current date during your voyage. If
your voyage lasts more than one week set current date at least once per week during your voyage.
NOTE! In order to display charts with correct updated situation during route planning, use always planned date of
each waypoint to check your plan.
How Temporary and Preliminary Notices to Mariners behave with Vector charts
In some cases the producer of chart (Hydrographic Office) is aware of changes which happen in the future. The
Hydrographic Office is able to include this kind of updates into the chart for later use. In paper chart world these
changes are published in Preliminary and Temporary Notices to Mariners. In ARCS these are know as T&P Notices.