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This section provides specific symbols for dangers that are not visible on the surface.
Based on common chart numbering, 1111 may cover areas like Ischia, Procida, or the Gulf of Naples. Look for:
While "Carta 1111" refers to paper chart standards, modern navigation uses ECDIS (Electronic Chart Display and Information System).
| Symbol | Meaning |
|--------|---------|
| Tidal diamond (purple square with letter) | Refer to tidal stream table |
| Arrow with speed | Dominant current direction & rate |
| HW / LW | High/Low water heights at specific point |