The Indian Health Service GIS System map was created from Indian Health Service data and publicly accessible data such as the National Atlas, U.S. Census Bureau, and the U.S.G.S. Geographic Names Information System. Several of the background layers are added using internet map services from the Environmental Systems Research Institute (ESRI). The map layers and data on this site are available to the public and can be downloaded, as well as used to create maps using the map interface provided. The mapping interface looks and feels similar to many mapping interfaces currently available to the public.
This is a young product and will be continually growing to include more data so check back frequently to see what is available.