🔍 Key Concepts

• Difference between EPA (Electronic Plotting Aid) and ARPA (Automatic Radar Plotting Aid) • Typical EPA capabilities: manual plotting vs. automatic target tracking and trial maneuvers • Common radar functions like VRM (Variable Range Marker) and EBL (Electronic Bearing Line) that exist even without EPA

💭 Think About

• Which option in the list is usually associated with more advanced automatic radar systems (ARPA) rather than a basic plotting aid? • Which options are standard, simple radar tools that you’d expect on almost any modern radar, even without EPA? • Think about whether an EPA normally predicts the result of a future course or speed change, or if it mainly displays target data and alarms.

✅ Before You Answer

• Identify which function requires automatic computation of future CPA/TCPA after a hypothetical maneuver • Separate basic radar display tools (VRMs/EBLs, target trails) from specialized decision‑support features • Ask: Which feature would most likely need a full ARPA system instead of a simple EPA?