The Maps Importer is an extension for the DataGrab module. With this Extension you can insert entries from you CSV into the Maps Fieldtype and Maps Locator module.
Make sure your system meets the minimum requirements:
When you move all the files to the correct location, Datagrab will handle it from there. After you created the task, you will see next to your field (on the field assignment page) the field settings for the Maps Fieldtype or Maps Locator field.