Navigation General · ECDIS & Electronic Aids
The primary advantage of ECDIS over a paper chart system is:
- AECDIS can replace radar as the primary collision-avoidance tool
- BECDIS automatically integrates position, chart data, and navigational sensors to provide continuous cross-track monitoring and alarm functions✓ Correct
- CECDIS eliminates the need to maintain any form of paper charts
- DECDIS provides real-time depth soundings from the vessel's keel
Explanation
ECDIS overlays the vessel's GPS position onto electronic navigational charts (ENCs) and provides alarms for anti-grounding (shallow water), off-track conditions, and proximity to hazards. It does not replace radar for collision avoidance. While ECDIS can substitute for paper charts under certain IMO carriage requirements, a back-up arrangement is still required, and ECDIS does not provide real-time soundings.
Authority: Bowditch (Pub. 9), Ch. 14
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