Which statement about the Navi-sailor 4000 ECDIS display capabilities is true?

• A. It can display AIS targets
• B. It can display ARPA targets
• C. It can display both AIS and ARPA targets
• D. It cannot display any targets

Answer: (C)

The Navi-sailor 4000 ECDIS is designed to show two kinds of target information: AIS targets and ARPA targets. AIS provides positions and identity data broadcast by other ships, helping you recognize who is nearby and assess their course and speed. ARPA targets come from radar-based tracking and give you calculated tracks, as well as collision-risk metrics like CPA and TCPA. Having both overlays gives a fuller, safer picture: you can see labeled AIS ships on the chart and also have predictive ARPA tracks for radar contacts. That’s why the statement that it can display both AIS and ARPA targets is the most accurate. Limiting it to only AIS or only ARPA would miss part of the useful information, and saying it cannot display targets is incorrect.