Tropical cyclones are one of the most important disastrous weather systems in influencing the navigational safety of ships.

热带气旋是影响船舶航行安全最重要的灾害性天气系统之一。

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At present, the level of navigational safety assessment weighs out the level of a country's shipping industry, but also a Important indicator transition.

目前，航行安全评价水平高低是评价一个国家航运水平高低的一个重要标志，也是一个国家由航运大国向航运强国转变的一个重要指标。

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Magnetic compass is one of directional navigation instrument in ship fitting, the deviation of magnetic compass will influence the navigational safety of ship.

摘要磁罗经是船舶装备的主要指向性航海仪器之一，磁罗经自差的大小将直接影响船舶的航行安全。

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In a statement shipping minister Stephen Hammond said the technology should improve navigational safety in "the busiest shipping channel in the world".

BBC: Navigational backup to aid ships in Dover straits

Through collaboration with the International Maritime Organization (IMO) and International Hydrographic Organization (IHO), the worldwide system of navigational and meteorological areas associated with the Global Maritime Distress Safety System (GMDSS) has recently been expanded by JCOMM to include five new areas in the Arctic.

UNESCO: Oceanographers and meteorologists discuss climate change, maritime and coastal safety | United Nations Educational, Scientific and Cultural Organization