United States Coast Guard Captains License Practice Exam

Question: 1 / 400

What is the primary use of a compass at sea?

To measure the ship's speed

To determine the vessel's heading

The primary use of a compass at sea is to determine the vessel's heading. A compass is a navigational instrument that shows direction relative to the Earth's magnetic poles. It is essential for maintaining a course over open water, allowing mariners to navigate effectively and accurately. By knowing their heading, sailors can ensure they are on the correct path to reach their destination or avoid hazards.

Other options, while related to navigation, do not represent the primary function of a compass. Speed measurement is typically done with a speedometer or knotmeter, and locating underwater obstacles often involves sonar or depth sounders. Weather updates are typically obtained through radio communications or weather instruments, rather than through a compass. Therefore, the compass's role in determining heading is crucial for safe and effective navigation at sea.

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To locate underwater obstacles

To provide weather updates

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