🔍 Key Concepts

• ECDIS performance standards in IMO SOLAS and IEC/IMO guidelines • The purpose of ECDIS: legal voyage data / track-keeping versus simple voyage planning info • Difference between own ship’s actual movement and calculated or auxiliary information (like ETA or engine data)

💭 Think About

• Ask yourself: Which of these items represents the ship’s actual navigational movement over the ground that would need to be reconstructed later? • Which options are calculated conveniences for the navigator, rather than critical data that must be automatically logged for safety investigations? • If an incident occurred and investigators used ECDIS, which specific type of data here would be most essential to replay the ship’s track and behavior minute by minute?

✅ Before You Answer

• Verify which choice directly reflects actual movement over the Earth’s surface that can be plotted on a chart. • Check which options depend on changing voyage conditions or human input and are not strictly required to be auto-recorded every minute. • Confirm that the data you pick would help reconstruct both track and heading history during an accident investigation.