Nowadays, the underwater acoustic positioning system is the mainstream of underwater navigation and localization.

从目前来看，水声定位系统是水下导航定位的主要手段。

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With remarkable accuracy, the pilots on the James Cook used an acoustic navigation system to "fly" the robot over the rock three miles (4.8km) down towards the oases of life thriving around the vents.

BBC: A deep sea mission of genuine exploration