The purpose of a thematic map is?

A thematic map is specifically designed to showcase and visually represent particular themes or characteristics of geospatial data. Its primary purpose is to communicate specific information, such as population density, climate zones, or economic trends, effectively to the map reader. By focusing on one or more themes, these maps help to reveal patterns and relationships within the data that might not be immediately apparent in more general maps.

In contrast, the other options describe different types of maps or purposes that do not align with the thematic map's objective. For instance, showing political boundaries is typically the focus of political or administrative maps. Serving as a GPS navigation aid is characteristic of road or navigation maps designed for route planning. Highlighting topographic features is the primary function of topographic maps, which emphasize elevation and landforms. The clarity of thematic maps lies in their ability to distill complex data into understandable visual formats, making option B the accurate choice.