🔍 Key Concepts

• 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

💭 Think About

• 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?

✅ Before You Answer

• 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.