Which statement correctly describes the SENC database in relation to ENC data and updates?

• A. ENC data and updates are stored in the RAW ENC files
• B. SENC is optional and not used by ECDIS
• C. ENC data and official updates are transformed into the SENC database
• D. SENC contains only historical data

Answer: (C)

The SENC database is the internal, ready-to-use version of ENC data that an ECDIS reads for display. It is created by taking the official ENC data and applying official updates, then transforming everything into the SENC format so the system can render charts quickly and reliably. This means ENC data and the official updates are converted into the SENC database, which is why that statement is correct. The RAW ENC files aren’t used directly by ECDIS in normal operation, SENC is the standard data layer the system relies on (not optional), and SENC contains the active chart data including the updates, not just historical records.