GAI was setup almost a year ago to have an graphical interface in an
OSS GIS platform for AnuGA.
We have managed to add a couple of functions for creating empty GIS
layer and automate the mesh gen based on the GIS.
The plugin runs under QGIS (http://download.osgeo.org/qgis/) . I
suggest to have a quick browse through QGIS manual esp for projection
setting, edit shapefiles, etc. But in general, it is a very user
friendly GIS platform.
The installation of the plugins is straigh forward. I have put an
example folder to give you an idea of how the GIS layers look like.
Feel free to contact me with any suggestions.