An ECDIS is required to display which information?
• ECDIS (Electronic Chart Display and Information System) primary purpose under SOLAS • Difference between chart (hydrographic) information and sensor overlays (radar, ARPA, AIS) • What IMO performance standards for ECDIS say must be displayed vs what may be displayed
• Ask yourself: What is the core function of ECDIS that it must always provide, even if no other sensors are connected? • Which of the listed items comes from the chart database itself, and which come from separate navigational sensors? • If all external sensors (radar/ARPA) were turned off, which of the options would ECDIS still be required to show in order to meet carriage requirements?
• Identify which option clearly represents hydrographic/chart data (depths, coastlines, buoys, dangers). • Separate in your mind what is mandatory ECDIS capability from optional overlays that depend on additional equipment. • Before choosing, confirm which items could be lost if the radar/ARPA inputs fail, and which item ECDIS must still display to remain a legal primary means of navigation.
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