magnetic variation chart

简明释义

磁偏差海图

英英释义

例句

1.Pilots rely on the magnetic variation chart for accurate navigation during flights.

飞行员依靠磁偏差图进行准确的飞行导航。

2.The magnetic variation chart is essential for sailors to avoid navigational errors.

对于水手来说，磁偏差图对于避免导航错误至关重要。

3.When planning a hiking route, it’s important to consult the magnetic variation chart for the area.

在规划远足路线时，咨询该地区的磁偏差图是很重要的。

4.Before setting sail, the captain reviewed the magnetic variation chart to adjust their compass readings.

在出航之前，船长查看了磁偏差图以调整他们的罗盘读数。

5.The magnetic variation chart helps in understanding how magnetic north differs from true north.

通过磁偏差图可以了解磁北和真北之间的差异。

作文

Navigating the vast oceans and skies has always been a challenging endeavor for humanity. With the advent of modern technology, we have made significant strides in improving our navigational methods. However, one essential tool that has stood the test of time is the magnetic variation chart. This chart plays a crucial role in navigation, particularly for mariners and aviators who rely on magnetic compasses to determine their heading.The magnetic variation chart is designed to show the difference between magnetic north and true north at various locations on Earth. This difference, known as magnetic variation or magnetic declination, can significantly impact navigation accuracy. As the Earth’s magnetic field is not uniform, the variation can change depending on where you are located. For instance, in some regions, the magnetic north may be several degrees east or west of true north, which can lead to navigational errors if not accounted for.To understand how to use a magnetic variation chart, it is important to first grasp the concept of magnetic declination. This angle is measured in degrees and indicates how much a compass points away from true north. Navigators must adjust their compass readings based on this variation to ensure they are heading in the correct direction. The magnetic variation chart provides this vital information, often represented with contour lines or isogonic lines that connect points of equal magnetic declination.Using a magnetic variation chart is relatively straightforward. First, a navigator must identify their current location on the chart. Once located, they can observe the magnetic variation indicated for that area. If the variation is east, the navigator should subtract the declination from their compass reading; if it is west, they should add it. This adjustment ensures that the course taken aligns with true north.In addition to aiding in navigation, the magnetic variation chart is also helpful for understanding changes in the Earth’s magnetic field over time. Magnetic declination is not static; it can shift due to various geological and solar phenomena. Therefore, navigators must regularly consult updated charts to ensure their information is current. Many countries provide these charts through their respective maritime and aviation authorities, ensuring that navigators have access to accurate data.Moreover, the importance of the magnetic variation chart extends beyond just traditional navigation. In an age where GPS technology dominates, understanding magnetic variation remains relevant. GPS relies on satellites and does not directly use magnetic north; however, many systems still incorporate magnetic heading for certain applications. Thus, a thorough understanding of how to read and interpret a magnetic variation chart can enhance a navigator's skills, even in a digital age.In conclusion, the magnetic variation chart is an indispensable tool for anyone involved in navigation, whether by sea or air. It allows for precise adjustments to compass readings, ensuring safe and accurate travel across the globe. As navigational techniques continue to evolve, the fundamental principles provided by the magnetic variation chart will remain essential for effective navigation. By mastering this tool, navigators can confidently traverse the world's waters and skies, honoring the rich tradition of exploration that has defined humanity's journey through time.

航行在广阔的海洋和天空中一直是人类面临的挑战。随着现代技术的发展，我们在改善导航方法方面取得了显著进展。然而，有一种重要工具经受住了时间的考验，那就是磁偏差图。这张图在导航中发挥着至关重要的作用，特别是对于依赖磁罗盘确定航向的海员和飞行员。磁偏差图旨在显示地球上不同位置的磁北与真北之间的差异。这种差异被称为磁偏差或磁倾角，可能会对导航准确性产生重大影响。由于地球的磁场并不均匀，因此偏差会根据你所在的位置而变化。例如，在某些地区，磁北可能会比真北偏东或偏西几个度，如果不加以考虑，可能会导致导航错误。要理解如何使用磁偏差图，首先必须掌握磁倾角的概念。这个角度以度数为单位，表示罗盘指向真北的偏离程度。导航员必须根据这个偏差调整他们的罗盘读数，以确保他们朝着正确的方向前进。磁偏差图提供了这一重要信息，通常以等高线或同磁线表示，连接相等磁偏差的点。使用磁偏差图相对简单。首先，导航员必须在图上找到他们当前的位置。一旦找到，他们就可以观察该地区指示的磁偏差。如果偏差是东，则导航员应从他们的罗盘读数中减去该偏差；如果是西，则应加上。这一调整确保所采取的航向与真北对齐。除了帮助导航外，磁偏差图还对理解地球磁场随时间变化的情况非常有帮助。磁偏差不是静态的；它可能因各种地质和太阳现象而发生变化。因此，导航员必须定期查阅更新的图表，以确保他们的信息是最新的。许多国家通过各自的海事和航空机构提供这些图表，确保导航员可以获得准确的数据。此外，磁偏差图的重要性超越了传统导航。在一个GPS技术占主导地位的时代，理解磁偏差仍然相关。GPS依赖卫星，并不直接使用磁北；然而，许多系统在某些应用中仍然结合了磁航向。因此，深入理解如何阅读和解释磁偏差图可以增强导航员的技能，即使在数字时代。总之，磁偏差图是任何参与导航的人不可或缺的工具，无论是海上还是空中。它允许对罗盘读数进行精确调整，确保安全和准确地穿越全球。随着导航技术的不断发展，由磁偏差图提供的基本原理将继续是有效导航的关键。通过掌握这一工具，导航员可以自信地穿越世界的水域和天空，尊重定义人类历史旅程的探索丰富传统。