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List of RTK correction services and NTRIP Casters in United States
If you’re in the United States of America and need centimeter-level position accuracy, you’ll need access to an RTK correction service or NTRIP Caster via the internet.
National RTK network in the USA
Many countries around the world have established their own National RTK Networks to support various high-precision GNSS applications within their borders. As far as we know, the United States of America does not have a national RTK network that operates across the entire country. However, we have identified some RTK services that operate in specific states.
If you know any RTK network in the USA which is not in the list, please contact us. Your input will help us provide better resources for the surveying community.
| Local operator | State |
|---|---|
| AL CORS | Paid NTRIP correction service in Alabama |
| AZCORS | Free NTRIP correction service in Arizona |
| ARDOT | Free NTRIP correction service in Arkansas" |
| CRTN | Free NTRIP correction service in California |
| Mesa County RTVRN | Free NTRIP correction service in Colorado |
| ACORN | Free NTRIP correction service in Connecticut |
| FPRN | Free NTRIP correction service in Florida |
| Indiana DoT | Free NTRIP correction service in Indiana |
| Iowa | Free NTRIP correction service in Iowa |
| KTC | Free NTRIP correction service in Kentucky |
| C4G REAL-TIME NETWORK | Paid NTRIP correction service in Louisiana |
| MaineDOT | Free NTRIP correction service in Maine |
| MaCORS | Free NTRIP correction service in Massachusets |
| MDOT | Paid NTRIP correction service in Michigan |
| MnCORS | Free NTRIP correction service in Minnesota |
| GCGC | Free NTRIP correction service in Mississippi |
| MODOT | Free NTRIP correction service in Missouri |
| MTSRN | Paid NTRIP correction service in Montana |
| NYSNet | Free NTRIP correction service in New York |
| North Carolina GNSS CORS and Real-Time Network | Paid NTRIP correction service in North Carolina |
| OHDT | Free NTRIP correction service in Ohio |
| ORGN | Free NTRIP correction service in Oregon |
| SCRTN | Paid NTRIP correction service in South Carolina |
| TDOT | Free NTRIP correction service in Tennessee |
| TxDOT | Free NTRIP correction service in Texas, but only Texas DOT employees and its contractors are allowed to use it |
| TURN GPS | Paid NTRIP correction service in Utah |
| VT CORS | Free NTRIP correction service in Vermont |
| PANGA | Free NTRIP correction service in Washingtion |
| WVRTN | Free NTRIP correction service in West Virginia |
| WISCORS | Free NTRIP correction service in Wisconsin |
Free international RTK correction services in the United States of America
If you only need pass-to-pass accuracy, and you don’t need to compare your measurements with local maps done by other companies, social-based RTK networks are the cheapest way to go. There are also free global correction services with calibrated base stations which are available in the USA. You can use them to achieve centimeter-level accuracy if you are lucky to have a base station close to you (remember that RTK only works up to 35-50 km):
| RTK2GO | Free global community based correction network without quality of service. It is good enough for pass-to-pass centimeter accuracy, but not good for calibrated surveying applications. To view the coverage map, open this page and click "View all" on the top right. |
| IGS | Free global low density high quality correction service. Explore a coverage map and register for the service |
| UNAVCO | Free global low density high quality correction service |
We have prepared a tutorial How to connect simpleRTK2B series receiver to a NTRIP correction service via PC.
Paid international correction services in the USA
If you could not find a base station in the free options or you need a supplier with quality of service, we prepared a list for you.
| u-blox PointPerfect | 2-4 centimeter accuracy augmentation service (RTK-SSR). Starting from 5.90$/month for up to 60 hours of use. Contact us to try it for FREE. |
| Swift Navigation Skylark | 1 centimeter RTK starting from 69$/month and sub decimeter RTK-SSR from 29$/month for unlimited use. Contact us to try it for FREE. |
Get your kit now and start enjoying centimeter-level accurate and reliable GNSS data in minutes!
Set up your own correction service
If you didn’t find anything nearby you or you simply would like to become independent from any service, check out our tutorial on How to set up your own base station.
