Sperry Marine VISIONMASTER FT ECDIS-E, User Manual

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ECDIS-E User Guide Charts
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The unofficial data prompts are as follows:

Unofficial Data in Primary Display

Unofficial Data in Secondary Display
SevenCs supports both official and unofficial data. The official boundary
line is always displayed to distinguish official and unofficial data, unless it
has been explicitly disabled by the operator using the `Official Boundary'
custom chart setting for the SevenCs engine, see Settings.
Certain C-Map chart databases include a combination of official and
unofficial chart data (see C-Map chart database descriptions above). While
all types are used for safety checking, only official ENC data can satisfy the
ECDIS requirements that may in some cases allow a vessel to navigate
without reliance on up-to-date paper charts.
Even when official ENC data is used the operator should be
mindful of the quality of data, and is encouraged to view the data
quality symbol at appropriate intervals and understand the meaning
of these symbols.