I have created a polygon based on a area of cultivated land. What I would like to do is add a 100 metre boundary around it. The way I have done it which is not that accurate is to use the measuring tool to mark 100 metre points around the polygon. Then I have created a polygon matching up these points. I then used the cutter tool to edit the middle part i.e. the original polygon. That creates two polygons and I then delete the middle section. Don't know if that is the best way to do it so interested to hear any alternatives.