If the true course (TC) is measured at 130 degrees with a variation of 2 degrees west, what is the magnetic course?

To determine the magnetic course from the true course, you need to account for magnetic variation, which is the difference between true north and magnetic north. In this case, the true course is 130 degrees and the variation is 2 degrees west.

When the variation is west, you subtract the variation from the true course to calculate the magnetic course. So, you take the true course of 130 degrees and subtract the 2 degrees of west variation. This results in a magnetic course of 128 degrees.

The correct answer reflects this adjustment. Therefore, the calculation leads to the magnetic course being 128 degrees. This demonstrates how understanding the relationship between true course and magnetic course is crucial in navigation, as accurate headings are essential for safely and effectively reaching your destination.