When using a nautical device, how do you read the third value?

The correct approach to reading the third value using a nautical device involves referencing the opposite scale of the two set values. This method is rooted in the functionality of various navigation instruments, such as a plotter or a compass, where a relationship exists between the different scales.

By identifying the two set values, you can understand how the third value interacts with them. The opposite scale provides a direct correlation that allows for an accurate reading. This is particularly important in navigation, where precision is crucial for ensuring safety and effective routing.

The other methods, such as reading from the visual display or estimating, may lead to inaccuracies and misunderstandings in navigation. Manual calculation could be used in specific situations, but it is often more cumbersome and prone to error compared to directly reading from the established scales. Thus, utilizing the opposite scale brings clarity and precision to determining the third value in nautical settings.