What is the typical format for expressing magnetic variation on a chart?

The typical format for expressing magnetic variation on a chart is indeed degrees and direction, such as indicating 5° East. This method clearly communicates both the angle of variation and the specific direction from true north, which is essential for navigators using magnetic compasses. Knowing the degree of variation along with its directional component allows pilots to adjust their compass readings effectively to ensure accurate navigation.

Using this format helps avoid confusion since magnetic variation can change depending on the geographic location. By specifying whether the variation is to the east or west, pilots can accurately determine how to convert between true heading and magnetic heading. This is a critical aspect of aviation navigation, as failure to account for magnetic variation can lead to significant navigational errors.

Other formats, such as radians and latitude, do not pertain to expressing magnetic variation and would not be useful for navigational purposes. Additionally, expressing magnetic variation in feet above sea level or in degrees and minutes is not standard practice in aviation charts. This reinforces the importance of understanding how magnetic variation is presented and why the degree and directional format is the most effective for navigating accurately.