What about sonar?

声纳呢？

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Ship-based sonar would help, but ship-based instruments have mapped only about 10 percent of the ocean floor so far.

尽管船舶声纳技术也用得上，但是迄今为止利用船舶器械仅仅绘制出海底地貌的10%。

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Supported by a project, this thesis presents the technology about passive sonar display and signal detection in design of the sonar display console.

本文结合工程项目的需要，介绍了在设计被动声纳显示平台中所使用的信号检测技术和显示处理技术。

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For instance, the idea that the Navy's sonar systems are harming whales is about as well based in fact as the 1960s fear that fluoride in our water was poisonous.

FORBES: Fact and Comment

And since the early 90s they have installed specialist buoys, tethered to the seabed, which use sonar to provide a near-constant stream of data about the ice above.

BBC: Arctic ice melting at 'amazing' speed, scientists find

You can read the whole backstory about Tacit here: How Trying to Make a Video Game Created Sonar for the Blind.

FORBES: Assistive Technology Device for the Blind