Currently, the navigation system has gradually become a hot topic. There are various navigation products in the market, including on-board navigation systems, ocean navigation systems.

当前，导航系统已逐步成为一项研究热点，各类导航产品已进入市场，包括车载导航系统，远洋轮船导航系统等。

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Mr Smith took a degree in Ocean Science and Marine Navigation at the University of Plymouth.

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And on 5 December last year, a Proton carrying three navigation spacecraft fell into the Pacific Ocean.

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The Bush administration is urging the Senate to consent this summer to the Convention on the Law of the Sea, the complex and sprawling treaty that governs shipping, navigation, mining, fishing and other ocean activities.

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