What is the main use of the straightedge method?

The straightedge method is primarily utilized for locating inaccessible points. This technique involves using a straightedge to create a visual line between known points on a map, which aids in determining the position of a point that cannot be easily accessed in the field. When navigating or planning operations, this method allows individuals to estimate locations based on their known coordinates or terrain features, making it especially useful in situations where direct measurement is not feasible.

While other choices touch upon important aspects of navigation and map reading, they do not encapsulate the unique purpose of the straightedge method as effectively. For example, calculating azimuths and determining grid coordinates involve different methods and tools, while using a ruler for map alignment pertains more to ensuring accuracy in map representation than to the specific task of locating points. The straightedge method stands out for its focus on enabling navigation to locations that are not directly reachable.