8. Vector Chart Material
8-76
8.12 Chart Viewing Dates and Seasonal Features of
the Vector Chart
8.12.1 Introduction
Vector charts (S57) contain date-dependent features. Updating in general, including reissues, new editions and
updates, creates date dependency. In addition to the obvious date dependency, some features of the S57 charts create
additional date dependency. These features include “Date Start”, “Date End”, “Seasonal date start” and “Seasonal
date end”. Hydrographic Offices use these features to publish Temporary and Preliminary Notices to Mariners, as
their paper chart equivalent updates are called. The ARCS equivalent is called T&P Notices. “Seasonal date start”
and “Seasonal date end” are used for seasonal chart features such as summer-only sea marks, seasonal yacht race
areas, etc. For further details see paragraph 8.12.5 “About chart viewing date dependency of S57 standard“.
You can efficiently use chart viewing date dependency to use the valid data for any given date applicable for your
navigation or planning purposes. For example, you can check for existence of changes and restrictions weeks before
they became valid. Date dependency is a part of the new electronic method to keep your chart up-to-date and valid
for your intended use. Normally you should set Display Until and Approve Until once per week to keep your chart
up-to-date.
Note: When you load charts and their updates into your system, the Display Until date is set as current date of the
system. You must set the Approve Until date yourself. Make sure that you have set Display Until and Approve Until
dates to the current date or to your planning date, whichever is applicable to your current usage of charts. For details
on how to set Display/Approve date, see the paragraph 8.12.2 “Approving and highlighting vector chart updates”. If
the charts you are currently using have Display Until and/or Approved Until set more than 1 week from current
system date, you will you get the Permanent Warning on your chart display.
8.12.2 Approving and highlighting vector chart updates
Before you approve updates, you can display (highlight) updates which are included into S57 charts. Normally you
have chosen “Automatic Display Until” after the SENC conversion. In this case, after all the SENC conversions
have been finished, all updates are automatically highlighted and you can view and approve them after viewing. For
further details, see paragraph 8.12.4 “Setting approve until date”.
If you want to review updates after the initial approval of the updates do the following:
1. Use Approve Until to set the begin date for the
update highlight. See paragraph 8.12.4 “Setting
“approve until date”.
2. Use Display Until to set the end date for the update
highlight. See paragraph 8.12.3 “Setting display
until date”.
3. Review the changes. Added features are
highlighted with orange circles. Removed features
are highlighted with orange slashes. Changed
features are highlighted with both orange circles
and slashes. See the picture at right.
4. After reviewing, set Approve Until and Display
Until back to the current system date.
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