About Chart Viewing Date Dependency Of S57 Standard - Furuno FEA-2107-BB Operator's Manual

8. Vector Chart Material
8.12.5

About chart viewing date dependency of S57 standard

How the issue date of updates changes the visibility of the changes
Study the example below to understand the behavior of updates relative to date.
The figure above shows how updates are dependent Chart viewing dates set in Display/Approve date settings by
operator. Actions 1 to 4 areas as 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 be set to current date.
2. The date when update 1 was issued. Display and Approve dates have to be set to correct date in order to see the
chart with update 1.
3. The date when update 2 was issued. Display and Approve dates have to be set to correct date in order to see the
chart with update 1 and update 2.
4. The date when update 3 was issued. Display and Approve dates have to be set to correct date in order to see the
chart with update 1, update 2 and update 3.
Note 1: In order to display charts with correct updated situation, always use 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 2: In order to display charts with correct updated situation during route planning, always use planned date of
each waypoint to check your plan.
How temporary and preliminary notices to mariners behave with vector charts (S57)
In some cases the producer of a chart (Hydrographic Office) is aware of changes that will happen in the future. A
Hydrographic Office is able to include this kind of update into the chart for later use. In the paper chart world, these
changes are published in Preliminary and Temporary Notices to Mariners. In ARCS these are known as T&P
Notices.
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