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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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。

youdao