Are you going to drive on Brazilian roads? Need a map? Sure, you could certainly use Google Maps, but there are other map options easier to print and full of information essential for the travelers. They indicate, for instance, where you will find unpaved roads, tollbooths, National Parks or Native Reservations etc.
Your first option would be to download state maps in zip format found on the website of the DNIT, the federal department of transportation infrastructure. Full of details, they are a great resource.
But, if you prefer a JPEG or PDF map, try these links, created by Guia Geográfico Brasil:
Rio Grande do Sul. Also, try the many versions in JPEG and PDF offered by state Tourism Authority.
Read also: Practical tips for driving in Brazil