Which device is used for making deep-sea soundings?

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The device specifically used for making deep-sea soundings is known as a fathometer. A fathometer measures the depth of water beneath a vessel by sending sound waves to the seabed and recording the time it takes for the echoes to return. It provides accurate measurements of depth, which is essential for navigation, fishing, and scientific research.

While sonar and echo sounders are similar technologies that use sound waves to determine distance, the term "fathometer" specifically refers to a device designed to measure water depth. It is tailored for hydrographic surveys and is especially useful in deep-sea applications where precise depth information is critical.

The mariner's compass, on the other hand, is a navigation instrument used to determine direction rather than depth. Therefore, it does not serve the purpose of making soundings. Understanding the specialized functions of these devices helps clarify why the fathometer is the correct choice for measuring deep-sea depths.

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