🔍 Key Concepts
• Electronic Chart System (ECS) primary sensor inputs
• Difference between navigation sensors (used for position and situational awareness) and security/alert systems
• Common ECS connections: position (GPS), speed log, radar, echo sounder (depth), AIS
💭 Think About
• For each option, ask: does every item provide data that helps the ECS with safe navigation and situational awareness?
• Identify which listed item is more about security/alerts than about providing continuous navigation data to the chart display.
• Think about which sensors are normally shown or configurable as overlays on an electronic chart (e.g., radar overlay, depth contours, vessel speed).
✅ Before You Answer
• Verify which systems are standard navigation sensors: GPS (position), speed log, gyro/heading, radar, echo sounder (depth).
• Check whether SSAS (Ship Security Alert System) normally feeds data to the Electronic Chart System, or is instead a separate security/emergency function.
• Confirm that all items in the correct lists are things whose data you would expect to see represented or used directly on the chart display.