Wisconsin Dept. of Transportation (WisDOT)
The WisDOT Geodetic Survey Unit has developed a Wisconsin Continuously Operating Reference Stations (WISCORS) Network, consisting of permanent GPS sites, which provide real-time correctors to mobile users. These mobile users that are properly equipped to take advantage of these correctors can survey in the field to the 2-cm accuracy level in real-time. The program is being partnered with state and local governments, federal agencies and educational institutions. WisDOT is pleased to announce the availability of the WISCORS network in the eastern portion of Wisconsin. The network consist of twenty-three CORS located throughout eastern Wisconsin (see attached map). Two more CORS sites located in Madison and Janesville will soon be operational.

To access WISCORS, go to WisDOT's WISCORS, then select the link "Accessing WISCORS" located on the left. From that page, select the link "WISCORS" to view more information or register as a user. To register as a user, select the "New users may register...", and proceed to fill out the form. After your information is submitted, the network administrators will receive notification, review your application, and then approve or deny your request. Upon approval, the administrators will assign you a user name and passcode to utilize the system. You need to register the name of a user for each rover unit. For example, if you have two GPS rover units, you need to register the names of two individuals, one for each unit. If you have one GPS rover and several survey personnel who might use the rover, then you only need to register one individual (the user name and passcode can be used by other team members for that one GPS rover). Currently, there is no charge to use the system, however a fee of approximately $500 per registered user per year will most likely be implemented on 1 January 2009. Discount rates will probably be used for entities that have several registered users with several GPS rovers.

We would like to thank the Partners who contributed facilities, power, internet connection, and in some cases a receiver towards the development and construction of WISCORS. Appreciation and thanks is also extended to personnel from Trimble Navigation, Seiler Instruments, WisDOT DBM BITS, and WisDOT DTSD who assisted in building this infrastructure. Lastly, two individuals should be recognized for their substantial work on the project, Elliot Smith from WisDOT Geodetic Surveys Unit and Chad Ingle from WisDOT DBM BITS.

National Geodetic Survey (NGS)
The NGS coordinates two networks of continuously operating reference systems (CORS) that provide GPS carrier and code range measurements in support of 3-dimentional positioning activities throughout the United States.

National CORS Network
Users can apply CORS data to position points at which GPS data have been collected. The CORS system enables positioning accuracies that approach a few centimeters relative to the National Spatial Reference System, both horizontally and vertically.

Cooperative CORS Network
The Cooperative CORS Network consists of GPS base stations whose data are freely disseminated by cooperating organizations. NGS provides a link from its web site to that cooperating organization, however the site coordinates must be consistent with the National Spatial Reference System.