🔍 Key Concepts

• ECDIS (Electronic Chart Display and Information System) capabilities and limitations • Difference between vector charts (e.g., ENC) and raster charts (e.g., RNC) • Which chart data types are typically approved for primary navigation on ECDIS

💭 Think About

• Think about what kinds of electronic chart data an ECDIS is designed to display for safe navigation—are they picture-like images, database-based objects, or both? • Consider which chart format allows you to click on objects (buoys, depths, areas) to see attributes, and which is more like a scanned paper chart. • Ask yourself: when ECDIS is used in full compliance mode, which official chart data formats can it legally and technically use?

✅ Before You Answer

• Verify which chart type is object-oriented and supports alarms and automatic safety checks. • Verify which chart type is more like a digital picture of a paper chart with limited interactivity. • Confirm which of the options could realistically describe all chart data formats an ECDIS unit is designed to incorporate, not just one of them.