Haiyang-2D (HY-2D) is an ocean monitoring satellite that was recently launched by China aboard a Long March-4B rocket. It, along with HY-2B and HY-2C satellites, will act as all-weather, round-the-clock dynamic ocean environment monitoring system that will provide early warning of marine disasters. These three satellites will form a constellation for disaster predictions, sustainable development and utilisation of marine resources and for other purposes.


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