Oh, sorry for the misunderstanding. The last time I looked at the CORS network in Central Iowa I only noted one station running. It looked like it was outputting data every 30 seconds as well. I just assumed that if you were not around the Ames area it would be better to operate your own base station because you would be closer to it, as well as the fact that your own base can give you corrections every one second vs. every thirty seconds. Maybe I do not have enough information.