Except for Sirius, the digital radio satellites (Worldspace's Afristar and Asiastar, DMX's on Intelsat Americas 6, Muzak and Dish Networks on Echostar 7, and the XM satellites) are in geosynchronus orbits, and so don't appear to move on the map. The Sirius constellation uses large, elliptical orbits, resulting in an interesting ground track!