Navigation General · ECDIS
On an ECDIS, the 'safety contour' is used to:
- ASet the screen brightness
- BShow the radar range rings
- CMark the magnetic variation
- DDefine the depth boundary between safe and unsafe water, triggering alarms if the ship approaches shoaler water✓ Correct
Explanation
The mariner sets a safety contour based on the ship's draft plus clearance; ECDIS highlights it and generates an alarm if the ship's track threatens to cross into water shoaler than the contour, a core anti-grounding feature.
Authority: IMO Performance Standards for ECDIS
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