9. VECTOR (S57) CHARTS
9-4
9.2 Chart Viewing Dates and Seasonal Features of
the S57 Chart
9.2.1 Introduction
S57 charts 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 Prelim-
inary Notices to Mariners, as their paper chart equivalent updates are called. "Season-
al date start" and "Seasonal date end" are used for seasonal chart features such as
summer-only sea marks, seasonal yacht race areas, etc.
You can efficiently use chart viewing date dependency in order 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 date and Up-
date Review once per week to keep your chart up-to-date.
9.2.2 How to set Display date and Update Review dates
Click the [Chart INFO] and [Viewing Dates] button on the InstantAccess bar™ to show
the [Viewing Date] dialog box. Set desired dates then click the [Close] button.
9.2.3 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.
1 2 3 4
Update 3
Update 2
Update 1
Base cell
Date
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