What is the primary use of marginal information on a map?

Marginal information on a map serves primarily for identification purposes. This information typically includes legends, scales, compass rose, and other annotations that help a user understand what the map represents. For example, the legend provides explanations for symbols and colors used on the map, allowing users to identify different features like rivers, roads, and political boundaries.

While interpretation, evaluation, and location are also important functions of maps, these roles are largely facilitated by the marginal information that helps clarify the content of the map. The ability to properly identify elements on a map is essential for effective use and understanding, making identification the primary use of marginal information.