đ 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
đ 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).
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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.