I have created a polygon in QGIS (in this case it describes a country's maritime baseline).
I need to create a second polygon whose boundary is a fixed distance from the original polygon. (in this case I need to create the territorial sea boundary, which lies 12 nautical miles outside the baseline).
I think geoprocessing tools>buffer is correct tool for this job? But I can't figure out what units QGIS uses for the
What should I enter in
buffer distance to generate a 12nm buffer?