CAIRN NTRIP services and RTK networks, mapped

Network RTK area

Single base · reach

Serves the state, area not mapped

Selected state

02 / COMPARE

Every NTRIP service, one table

The NTRIP services we know of in the US, free and paid.

24 providers

Service	Coverage	Network	Stations	Fee
	36 statesCommercial service	Network RTKVRS + single base	1,628	Paid
Fee & access Paid Point One True RTK subscription; a 14-day trial is available. US$85/month or US$750/year for True RTK (published price). Start a Point One trial or subscription and obtain device NTRIP credentials. How we map coverage Network area estimated from 1,628 stations, where neighbouring stations sit within 70 km. Not an operator map. Verified 2026-10-13 Correction stream sampled with an account. Visit Point One RTK Show on the map
	51 statesCommercial service	Network RTKVRS	—	Paid
Fee & access Paid network RTK; a 14-day trial is available. Quote on request. Apply for an RTK Premium trial or subscription. How we map coverage Coverage area as published by the operator. Last checked 2026-10-13 Against the operator's public information. Visit RTK Premium Show on the map
	49 statesCommercial service	Network RTKVRS	—	Paid
Fee & access Paid network RTK subscription; a 14-day trial is available. US$69/month or US$699/year (published price). Register for a Skylark Nx RTK trial or subscription to obtain NTRIP credentials. How we map coverage Coverage area as published by the operator. Verified 2026-10-13 Correction stream sampled with an account. Visit Swift Skylark Nx RTK Show on the map
	48 statesCommercial service	Single basenearest station	3,918	Paid
Fee & access Paid RTK subscription; a 30-day trial is available by application. US$40/month or US$400/year (published price). Apply for a 30-day trial account; credentials are issued after approval. How we map coverage Each of 3,918 stations drawn with a 20 km reach; adjust it on the map above. Last checked 2026-10-13 Against the operator's public information. Visit GEODNET Show on the map
	20 statesCommercial service	Single basenearest station	1,534	Paid
Fee & access Paid nearest-station RTK or fixed-station STREAM; usage fees apply. RTK US$20/30 days; STREAM US$100/30 days; plus US$0.15/hour. Register for onocoy RTK or STREAM and obtain NTRIP credentials. How we map coverage Each of 1,534 stations drawn with a 20 km reach; adjust it on the map above. Last checked 2026-10-11 Against the operator's public information. Visit onocoy Show on the map
	7 statesNationwide service	Single basenearest station	1,001	Conditional
Fee & access Free licensed noncommercial use; commercial access is paid. Eligible noncommercial scientific, educational and humanitarian use. US$1,000/seat/year for commercial use. Register and obtain an EarthScope real-time data licence. How we map coverage Each of 1,001 stations drawn with a 20 km reach; adjust it on the map above. Last checked 2026-10-11 Against the operator's public information. Visit EarthScope GNSS Realtime Show on the map
	6 statesNationwide service	Single basenearest station	6	Free
Fee & access Free community single-base RTK; no receiver account is required. Use the public Centipede-RTK caster without receiver registration. How we map coverage Each of 6 stations drawn with a 20 km reach; adjust it on the map above. Last checked 2026-10-11 Against the operator's public information. Visit Centipede-RTK Show on the map
	3 statesNationwide service	Single basenearest station	136	Free
Fee & access Free public caster; some listed base locations are stream-verified. Use a valid email address as the NTRIP username; no website account is needed. How we map coverage Each of 136 stations drawn with a 20 km reach; adjust it on the map above. Verified 2026-10-11 Correction stream sampled with an account. Visit RTK2go Show on the map
	1 stateNationwide service	Single basenearest station	45	Free
Fee & access Free real-time GNSS observation streams; registration is required. Register for free NTRIP credentials; standard access is limited to five streams. How we map coverage Each of 45 stations drawn with a 20 km reach; adjust it on the map above. Last checked 2026-10-11 Against the operator's public information. Visit BKG IGS-IP OSR Show on the map
	TexasState network	Network RTKVRS	244	Conditional
Fee & access No-fee access for TxDOT-authorized users; not generally open to the public. TxDOT personnel and project-authorized contractors or consultants. Contact TxDOT RTN to confirm project eligibility and request credentials. How we map coverage Network area estimated from 244 stations, where neighbouring stations sit within 70 km. Not an operator map. Last checked 2026-10-13 Against the operator's public information. Visit TxDOT RTN Show on the map
	OregonState network	Network RTKMAX / i-MAX + single base	136	Free
Fee & access Free Oregon real-time GNSS service; account approval is required. Submit an ORGN rover account request to obtain NTRIP credentials. How we map coverage Each of 136 stations drawn with a 20 km reach; adjust it on the map above. Last checked 2026-10-11 Against the operator's public information. Visit ORGN Show on the map
	WisconsinState network	Network RTKVRS + single base	125	Free
Fee & access No-fee RTK network, according to the published operator survey. Register for WISCORS; approved users receive connection settings by email. How we map coverage Network area estimated from 125 stations, where neighbouring stations sit within 70 km. Not an operator map. Last checked 2026-10-11 Against the operator's public information. Visit WISCORS Show on the map
	MichiganState network	Network RTKVRS + single base	125	Free
Fee & access Free Michigan RTK products; account registration is required. Register for MSRN and select the required RTK products. How we map coverage Network area estimated from 125 stations, where neighbouring stations sit within 70 km. Not an operator map. Last checked 2026-10-11 Against the operator's public information. Visit MSRN Show on the map
	IowaState network	Network RTKMAX / i-MAX + single base	105	Free
Fee & access Free RTK service; select a free two-year subscription after registration. Register for IaRTN and select a free two-year RTK subscription. How we map coverage Each of 105 stations drawn with a 20 km reach; adjust it on the map above. Last checked 2026-10-11 Against the operator's public information. Visit IaRTN Show on the map
	FloridaState network	Network RTKVRS + single base	102	Free
Fee & access Free RTK service; registration and email activation are required. Register for FPRN and complete email activation. How we map coverage Each of 102 stations drawn with a 20 km reach; adjust it on the map above. Verified 2026-10-12 Correction stream sampled with an account. Visit FPRN Show on the map
	AlaskaState network	Network RTKVRS + single base	89	Free
Fee & access Free Alaska RTK service; account registration is required. Register for an Alaska ACORN account to obtain NTRIP credentials. How we map coverage Network area estimated from 89 stations, where neighbouring stations sit within 70 km. Not an operator map. Last checked 2026-10-11 Against the operator's public information. Visit Alaska ACORN Show on the map
	ArizonaState network	Network RTKVRS + single base	77	Free
Fee & access Free RTK service; registration is required. Register for AZCORS to request NTRIP access. How we map coverage Each of 77 stations drawn with a 20 km reach; adjust it on the map above. Last checked 2026-10-12 Against the operator's public information. Visit AZCORS Show on the map
	MississippiState network	Network RTKVRS + single base	70	Free
Fee & access Free real-time GNSS service; account registration is required. Register for a GCGC RTN account to obtain NTRIP credentials. How we map coverage Network area estimated from 70 stations, where neighbouring stations sit within 70 km. Not an operator map. Last checked 2026-10-11 Against the operator's public information. Visit GCGC RTN Show on the map
	OhioState network	Network RTKVRS	66	Free
Fee & access No-fee RTK service, as reported in the published operator survey. Contact Ohio RTN to request an account. How we map coverage Network area estimated from 66 stations, where neighbouring stations sit within 70 km. Not an operator map. Last checked 2026-10-11 Against the operator's public information. Visit Ohio RTN Show on the map
	New YorkState network	Network RTKVRS + single base	58	Free
Fee & access Free RTK service; annual subscriptions require approval. Register for NYSNet and request the appropriate annual subscription. How we map coverage Network area estimated from 58 stations, where neighbouring stations sit within 70 km. Not an operator map. Last checked 2026-10-11 Against the operator's public information. Visit NYSNet Show on the map
	KentuckyState network	Network RTKVRS	58	Free
Fee & access Free VRS service; account registration is required. Register for KYCORS to obtain NTRIP credentials. How we map coverage Network area estimated from 58 stations, where neighbouring stations sit within 70 km. Not an operator map. Last checked 2026-10-11 Against the operator's public information. Visit KYCORS Show on the map
	ArkansasState network	Network RTKVRS + single base	55	Free
Fee & access Free public RTK service; a signed user agreement and approval are required. Submit the ARDOT RTN user agreement for account approval. How we map coverage Network area estimated from 55 stations, where neighbouring stations sit within 70 km. Not an operator map. Last checked 2026-10-11 Against the operator's public information. Visit ARDOT RTN Show on the map
	MassachusettsState network	Network RTKMAX / i-MAX + single base	23	Free
Fee & access Free RTK service; registration and subscription approval are required. Register for MaCORS and request approval for the RTK subscription. How we map coverage Each of 23 stations drawn with a 20 km reach; adjust it on the map above. Last checked 2026-10-11 Against the operator's public information. Visit MaCORS Show on the map
	ConnecticutState network	Network RTKVRS + single base	13	Free
Fee & access Free Connecticut RTK service; account registration is required. Register for an ACORN CT account to obtain NTRIP credentials. How we map coverage Network area estimated from 13 stations, where neighbouring stations sit within 70 km. Not an operator map. Last checked 2026-10-11 Against the operator's public information. Visit ACORN CT Show on the map