What is the primary purpose of using a graticule on maps?

The primary purpose of using a graticule on maps is to organize geographic information with coordinates. A graticule is the network of parallels (latitude lines) and meridians (longitude lines) that divide the map into a grid system. This coordinate system allows users to accurately locate positions on the Earth's surface by providing specific reference points that can be communicated universally. The grid helps in navigation, mapping, and understanding spatial relationships by making it easier to pinpoint specific locations based on latitude and longitude.

The other choices do not accurately represent the primary function of a graticule. While enhancing aesthetic appeal may be a by-product of some map features, it is not the main purpose of a graticule. Similarly, a graticule does not provide a three-dimensional view; it represents a two-dimensional plane of geographic coordinates. Lastly, indicating weather patterns is unrelated to the function of a graticule, which focuses on geographical positioning rather than environmental data representation.