Instruction in cartographic or map literacy in technical communication courses can support pedagogies promoting social change. Students must develop an ability to read, understand, interpret, use, and critique maps in technical communication contexts. This article argues that attention to cartographic literacy can build on existing visual literacies to promote critical understanding of how to use and create maps that engage with issues related to social change. A description of a sample assignment is included to introduce cartographic literacy in undergraduate technical communication courses. Student map examples support the conclusion that students benefit from instruction in cartographic literacy and that cartographic literacy can be an important component of technical communication pedagogies that work toward social justice.