Geotagging takes no term

First, thanks for the work you have done with this fantastic module. I'm using it with openpublish and I found it very useful.

OpenCalais generates the list of tags correctly. When I create an article or event, I can see that recognizes the tags. Even the terms are created in its corresponding taxonomy.

But when I edit an article, observed in the Calais Geotagging field the following message: "There Are not Calais Terms with geo coordinates available for mapping."

Does this mean that the city exists in the City Taxonomy is not going to present it on the map? Geopositioning Is it necessary? At first I did not understand it was necessary, but if so, how do I put the coordinates?

Thanks