I have an excel sheet with information taken about specific Latitudes and Longitudes, so my excel has a list of metrics and the respective GPS positions. I want to show these metrics in a map agregated by region and country. How can I do it? (I don't have ArcGIS license)
I'm assuming you already have a field in your records with country and region. Tableau does not provide a way to generate that data for you.
You can create a drill-down hierarchy of country/region/unique id and put AVG(Latitude) and AVG(Longitude) on the shelves. That should work out pretty well. If you post some sample data I can build a workbook for you.