DATA CHECKED OCT 2026
All states / California

RTK corrections in California

Paid  26 options · California Real Time Network (CRTN) · SOPAC / UC San Diego · 2 regional/private network(s)

Compare all 26 RTK options in California

Every way to get RTKReal-time kinematic. A way to make GPS accurate to about an inch by getting live corrections from a nearby base station.Full definition CorrectionsLive info from a base station about how far off the satellite signals are, so your rover can cancel out the error.Full definition here, side by side: the state network, regional or private networks, and nationwide services. Tap a name for the full details page. Want to know about one exact spot? Check an address or ZIP →

OptionAccessPriceFree trialCasterMount typesNotesChecked
California Real Time Network (CRTN)
State-run network
Paid1 account per organization: $100 one-time registration contribution; more access through a $1,000/yr data contribution—132.239.152.4:2102Single base (pick nearest station)SOPAC / UC San Diego2026-10-17
AZGPS GNSS Network
Regional private
Paid$50/day, $300/mo, $2,000/yr; 7-day free trial7 days freeAfter signupVRSVirtual reference station. The network blends nearby stations to create a pretend base right next to you, which keeps the baseline short.Full definition and single base (Trimble Pivot VRS3Net)AZGPS (Arizona). Arizona plus parts of Southern California; Trimble Pivot VRS3Net2026-10-17
Caltrans RTNs (District 6 and others)
Restricted (state DOTDepartment of Transportation. The state agency that runs many of the free state RTK networks.Full definition)
RestrictedNot available to the publicNot published (restricted network, not open to the public)After signupNot published (restricted network, not open to the public)Caltrans. Caltrans districts; not open to the public2026-10-17
Point One Navigation Polaris
Commercial network
PaidVirtual RTK $42/mo per license (~10 cm); True RTK $125/mo per license (1-3 cm); annual discounts14 days, no credit card required; includes Virtual RTK or Trpolaris.pointonenav.com:2101Not publishedUS nationwide. Check the provider's coverage map for your area.2026-10-17
GEODNET RTK
Community network
Paid$40/mo or $400/yr per deviceFree RTK trial offered (link on store page)rtk.geodnet.com:2101Nearest single baseGlobal community-built network. Check the provider's coverage map for your area.2026-10-17
RTKdata
Commercial network
Paid$40/mo, $400/yr, or $1,920 for 5 yrs per device30 days, full service, no credit card, no auto-renewrtk.rtkdata.com:2101Nearest single baseGlobal. Check the provider's coverage map for your area.2026-10-17
E38 RTK Premium
Reseller
PaidFrom $100 (shortest term; see page for durations)—rtkpremium.xyz:2101Not publishedReseller; coverage varies by state. Check the provider's coverage map for your area.2026-10-17
Emlid Corrections
Commercial network
Paid1 yr included with eligible Reach receivers; top-up $699/1 yr or $1,199/3 yr per device (via E38)—NotNot publishedEmlid receivers only. Check the provider's coverage map for your area.2026-10-17
u-blox PointPerfect Flex
Commercial network
PaidFrom $5.90/mo (up to 100 hrs); 30-day free trial30-day free trial (u-blox and non-u-blox receivers)ppntrip.services.u-blox.com:2101Not publishedRTK-SSR, global. Check the provider's coverage map for your area.2026-10-17
Swift Navigation Skylark
Commercial network
PaidFrom $69/mo (1 cm RTK) or $29/mo (sub-decimeter RTK-SSR) per ArduSimple14 daysna.l1l2:2101Not publishedCheck the provider's coverage map for your area.2026-10-17
Leica (HxGN) SmartNet
Commercial network
PaidNot published—<state:9301iMAX network, nearest single basePrice not published. Check the provider's coverage map for your area.2026-10-17
Trimble VRS Now
Commercial network
PaidNot published—www.vrsnow.us:2101Not publishedPrice not published. Check the provider's coverage map for your area.2026-10-17
Topcon Topnet Live
Commercial network
Paid$1,800 new US subscription (Topcon store); monthly/project terms via dealers—After signupNot publishedUS network, 200 stations added Jan 2025; works with any network RoverThe receiver that moves around the job, like a survey pole or a drone. It uses the base's corrections to find its exact spot.Full definition. Check the provider's coverage map for your area.2026-10-17
Carlson SkyNet RTN
Commercial network
Paid$1,500/yr; 14-day free trial14 daysAfter signupNot publishedUS nationwide, single NTRIPThe standard way RTK corrections are sent over the internet. Think of it as internet radio for correction data.Full definition Mount pointOne specific correction stream on a caster, like one channel on a radio. Each one comes from a certain station or network setup.Full definition, 1,700+ bases. Check the provider's coverage map for your area.2026-10-17
RTK2GO
Free community CasterThe internet server that hands out correction streams. Your rover logs in to it, like tuning into a radio station.Full definition
FreeFree community caster; no quality guarantees—rtk2go.com:2101Not publishedCoverage depends on volunteer bases. Check the provider's coverage map for your area.2026-10-17
NOAA NGS CORS
Post-processing data
FreeFree post-processing data (RINEXA standard file format for raw GPS data. Any brand of receiver or software can read it.Full definition); not a real-time RTK service—NotNot publishedUse for PPKPost-processed kinematic. Like RTK, but the corrections are applied after the job using recorded data, so no live link is needed.Full definition, not live RTK. Check the provider's coverage map for your area.2026-10-17
Onocoy
Nationwide / community
Paid$20 per 30 days + $0.15/hr used—clients.onocoy.com:2101Nearest single baseCommunity-built global network; pay per hour. Check the provider's coverage map for your area.2026-10-17
EarthScope NOTA real-time streams
Nationwide / scientific
FreeFree for non-commercial use; commercial license required—ntrip.earthscope.org:2101Single base (you pick a station)Science-grade stations (NOTA); pick a station near you. Check the provider's coverage map for your area.2026-10-17
Emlid Caster
Free relay for your own base
FreeFree (relay for your own Base stationA GNSS receiver sitting still on a known spot. It figures out how wrong the satellite signals are right now and shares that as corrections.Full definition)—caster.emlid.com:2101Your own base (single base)Not a network: sends YOUR base's corrections to your rover over the internet. Check the provider's coverage map for your area.2026-10-17
Trimble CenterPoint RTX
Nationwide / satellite PPP
Paid$1,150/yr (US dealer listing)—NotPPP (RTX), delivered by L-band satellite or internetSatellite PPP; works without cell signal; Trimble receivers. Check the provider's coverage map for your area.2026-10-17
Trimble Catalyst
Nationwide / subscription GNSSGlobal Navigation Satellite System. The general name for GPS (USA) and the other satellite systems like GLONASS, Galileo and BeiDou.Full definition
Paid$455/mo per user (dealer listing)—NotNot publishedSubscription GNSS for phones/tablets with the DA2 antenna. Check the provider's coverage map for your area.2026-10-17
NovAtel TerraStar
Nationwide / satellite PPP
PaidNot published (dealer quote)—sid-output.com:2101PPP corrections by L-band satellite or internetSatellite PPP (also sold as Leica SmartLink and by Ag Leader). Check the provider's coverage map for your area.2026-10-17
John Deere RTK
Ag network (dealer)
PaidNot published (dealer); forum reports ~$1,250-$1,500/machine/yr—NotNot publishedAg: StarFire receivers via Deere dealers. Check the provider's coverage map for your area.2026-10-17
Case IH AFS RTK+
Ag network (dealer)
Paid$838.10/yr (dealer listing)—After signupNot publishedAg: cellular RTK for Case IH AFS receivers. Check the provider's coverage map for your area.2026-10-17
New Holland PLM RTK+
Ag network (dealer)
PaidNot published (dealer subscription)—After signupNot publishedAg: cellular RTK to a tractor modem, 1.5 cm. Check the provider's coverage map for your area.2026-10-17
IGS real-time streams (IGS-IP / BKG)
Scientific network
FreeFree (registration required)—igs-ip.net:2101Single global stations (raw data) and SSR products for real-time PPPScience streams: raw global stations and real-time PPP orbit/clock corrections; not a plug-and-play RTK service. Check the provider's coverage map for your area.2026-10-17
NOAA CORS (NCN)Free Post-processing onlyFree—No caster (download files)Post-processing (RINEX)212 station(s) in state. RINEX for PPK and OPUSOnline Positioning User Service. A free NOAA website: upload a GPS file and it emails back the precise position of that spot.Full definition, not live RTK. Stations ↓—

California Real Time Network (CRTN)

Paid
Operator
SOPAC / UC San Diego
Access
Paid
Price
1 account per organization: $100 one-time registration contribution; more access through a $1,000/yr data contribution
Coverage
California

NTRIP caster

casterProvided by the operator after registration
Not really free: operator registration form asks for a $100 non-refundable contribution. The SOPAC site timed out.
Sign up / request access →Network info & station mapFull network details →
✓ VerifiedChecked 2026-10-16 · operator source · Sources: [1]

PPK with NOAA CORS in California

NOAANational Oceanic and Atmospheric Administration. The US agency that includes NGS and runs the CORS network.Full definition's permanent base stations record satellite data all day and post it free. You can download those files and use them after a job to correct your drone or rover data (PPK), or to pin down your own base with OPUS. This is not live RTK. This state has 212 working station(s). Each NGSNational Geodetic Survey. The part of NOAA that runs the official US coordinate system, CORS and OPUS.Full definition site log has the station's name and details.

San FranciscoANA1AZU1BILLBKAPBLYTBMHLCACCCAPOCARHCASNCASRCAT2CAT3CCCCCMBBCMODCNPPCOPRCOSOCRBTCRU1CSSTDSSCEWPPGISAGLRSGMPKGNPSGOL2HNPSIID2IMPSISLKJPLMLORSMLFPMODBMONPMUSBNOCOOHLNORESORVBOZSTP059P060P066P091P093P094P140P143P146P148P149P150P151P154P157P158P159P162P164P165P168P169P170P171P172P173P176P181P183P185P188P190P196P198P206P210P217P222P224P225P230P231P237P242P245P254P256P261P267P268P270P271P277P278P280P282P283P284P287P295P302P304P305P306P307P310P314P319P325P329P332P334P336P339P341P343P344P345P346P347P348P349P463P467P468P470P472P473P474P475P478P480P482P483P486P494P500P513P516P521P523P526P532P534P539P544P554P560P563P565P566P567P572P582P584P591P592P594P598P602P603P610P611P614P615P619P621P623P625P630P636P650P651P671P674P730P731P784P786PLSBPTSGQUINRDMTS300SACRSBCCSCIPSFDMSHINSIO5SKYBSLACSLMSSNI1SRS1SUTBTIBBTJRNTORPTOSTTRAKTRNDUSGCVDCYVNDPWINTZLA1ZOA1
Tap or hover a dot: — NOAA CORSContinuously Operating Reference Station. A permanent GPS receiver that records satellite data all day, every day.Full definition station   City
212 operational NOAA CORS stations plotted at their published positions (NGS ITRF2020 coordinates). State outlines: US Census Bureau via us-atlas. Cities: Natural Earth (public domain).
Station IDLat, LonNGS links
ANA134.0150, -119.3635Coordinates · Site log
AZU134.1260, -117.8965Coordinates · Site log
BILL33.5782, -117.0646Coordinates · Site log
BKAP35.2871, -116.0804Coordinates · Site log
BLYT33.6104, -114.7148Coordinates · Site log
BMHL34.2514, -116.0530Coordinates · Site log
CACC41.7456, -124.1843Coordinates · Site log
CAPO37.7142, -122.2221Coordinates · Site log
CARH35.8884, -120.4308Coordinates · Site log
CASN34.4157, -119.8453Coordinates · Site log
CASR38.4407, -122.7470Coordinates · Site log
CAT233.3116, -118.3338Coordinates · Site log
CAT333.4458, -118.4830Coordinates · Site log
CCCC35.5653, -117.6712Coordinates · Site log
CMBB38.0342, -120.3860Coordinates · Site log
CMOD37.6413, -121.0000Coordinates · Site log
CNPP33.8576, -117.6089Coordinates · Site log
COPR34.4149, -119.8795Coordinates · Site log
COSO35.9823, -117.8089Coordinates · Site log
CRBT35.7916, -120.7508Coordinates · Site log
CRU134.0293, -119.7848Coordinates · Site log
CSST34.4081, -119.3713Coordinates · Site log
DSSC33.7333, -116.7121Coordinates · Site log
EWPP34.1042, -117.5256Coordinates · Site log
GISA34.0693, -117.2183Coordinates · Site log
GLRS33.2748, -115.5214Coordinates · Site log
GMPK33.0511, -114.8273Coordinates · Site log
GNPS34.3086, -114.1894Coordinates · Site log
GOL235.4252, -116.8893Coordinates · Site log
HNPS33.7050, -115.6353Coordinates · Site log
IID232.7062, -115.0318Coordinates · Site log
IMPS34.1576, -115.1451Coordinates · Site log
ISLK35.6623, -118.4743Coordinates · Site log
JPLM34.2048, -118.1732Coordinates · Site log
LORS34.1333, -117.7541Coordinates · Site log
MLFP33.9184, -117.3180Coordinates · Site log
MODB41.9023, -120.3028Coordinates · Site log
MONP32.8919, -116.4223Coordinates · Site log
MUSB37.1699, -119.3093Coordinates · Site log
NOCO33.9197, -117.5696Coordinates · Site log
OHLN38.0063, -122.2730Coordinates · Site log
ORES34.7391, -120.2786Coordinates · Site log
ORVB39.5546, -121.5003Coordinates · Site log
OZST34.6834, -119.3534Coordinates · Site log
P05938.9284, -123.7262Coordinates · Site log
P06040.9976, -122.4149Coordinates · Site log
P06632.6165, -116.1698Coordinates · Site log
P09136.6143, -117.5315Coordinates · Site log
P09336.6060, -117.9942Coordinates · Site log
P09437.2008, -117.7042Coordinates · Site log
P14038.8292, -120.6932Coordinates · Site log
P14338.7602, -119.7648Coordinates · Site log
P14639.3375, -120.5373Coordinates · Site log
P14840.4186, -120.8060Coordinates · Site log
P14939.6021, -120.1050Coordinates · Site log
P15039.2924, -120.0339Coordinates · Site log
P15140.2889, -120.0773Coordinates · Site log
P15441.8071, -123.3601Coordinates · Site log
P15740.2475, -124.3081Coordinates · Site log
P15840.4225, -124.1072Coordinates · Site log
P15940.5048, -124.2828Coordinates · Site log
P16240.6911, -124.2370Coordinates · Site log
P16440.1193, -123.6933Coordinates · Site log
P16540.2456, -123.8533Coordinates · Site log
P16840.6686, -123.8815Coordinates · Site log
P16940.7912, -123.9677Coordinates · Site log
P17040.8802, -123.8633Coordinates · Site log
P17136.4855, -121.7925Coordinates · Site log
P17236.2281, -121.7673Coordinates · Site log
P17335.9457, -121.2903Coordinates · Site log
P17637.4718, -122.3571Coordinates · Site log
P18137.9145, -122.3768Coordinates · Site log
P18338.3137, -123.0689Coordinates · Site log
P18539.2613, -123.7493Coordinates · Site log
P18838.6679, -123.2296Coordinates · Site log
P19039.2420, -123.2040Coordinates · Site log
P19638.2981, -122.7426Coordinates · Site log
P19838.2599, -122.6075Coordinates · Site log
P20638.7778, -122.5758Coordinates · Site log
P21036.8161, -121.7318Coordinates · Site log
P21737.1045, -121.6506Coordinates · Site log
P22237.5392, -122.0833Coordinates · Site log
P22437.8639, -122.2191Coordinates · Site log
P22537.7139, -122.0583Coordinates · Site log
P23037.8190, -121.7864Coordinates · Site log
P23136.6217, -121.9054Coordinates · Site log
P23736.6370, -121.3868Coordinates · Site log
P24236.9539, -121.4632Coordinates · Site log
P24537.7131, -119.7061Coordinates · Site log
P25437.4896, -121.4692Coordinates · Site log
P25637.9320, -121.6048Coordinates · Site log
P26138.1530, -122.2175Coordinates · Site log
P26738.3803, -121.8232Coordinates · Site log
P26838.4735, -121.6464Coordinates · Site log
P27039.2438, -122.0552Coordinates · Site log
P27138.6574, -121.7146Coordinates · Site log
P27737.1924, -122.3669Coordinates · Site log
P27835.7112, -121.0608Coordinates · Site log
P28035.5441, -120.3476Coordinates · Site log
P28235.8378, -120.3452Coordinates · Site log
P28335.8067, -120.2853Coordinates · Site log
P28435.9333, -120.9069Coordinates · Site log
P28736.0248, -120.6978Coordinates · Site log
P29535.6971, -120.8424Coordinates · Site log
P30236.6347, -120.6186Coordinates · Site log
P30436.7390, -120.3566Coordinates · Site log
P30537.3522, -120.1968Coordinates · Site log
P30637.7952, -120.6445Coordinates · Site log
P30736.9473, -120.0579Coordinates · Site log
P31038.7356, -120.3343Coordinates · Site log
P31439.6857, -123.5819Coordinates · Site log
P31939.7071, -123.2951Coordinates · Site log
P32541.1517, -123.8826Coordinates · Site log
P32940.0822, -123.4520Coordinates · Site log
P33240.5466, -123.1745Coordinates · Site log
P33439.4936, -122.7359Coordinates · Site log
P33639.5281, -122.4305Coordinates · Site log
P33940.0341, -122.6683Coordinates · Site log
P34140.6507, -122.6069Coordinates · Site log
P34340.8871, -123.3342Coordinates · Site log
P34439.9291, -122.0280Coordinates · Site log
P34540.2712, -122.2708Coordinates · Site log
P34639.7947, -120.8675Coordinates · Site log
P34741.1833, -120.9485Coordinates · Site log
P34840.9055, -121.8280Coordinates · Site log
P34940.7311, -122.3194Coordinates · Site log
P46336.0225, -117.1647Coordinates · Site log
P46736.5702, -118.0906Coordinates · Site log
P46836.9757, -118.1184Coordinates · Site log
P47034.4624, -117.3939Coordinates · Site log
P47232.8892, -117.1047Coordinates · Site log
P47332.7338, -116.9495Coordinates · Site log
P47433.3552, -117.2487Coordinates · Site log
P47532.6664, -117.2439Coordinates · Site log
P47833.2357, -117.0716Coordinates · Site log
P48032.9760, -116.3485Coordinates · Site log
P48233.2402, -116.6714Coordinates · Site log
P48333.0592, -116.5693Coordinates · Site log
P48633.2602, -116.3223Coordinates · Site log
P49432.7597, -115.7321Coordinates · Site log
P50032.6900, -115.2999Coordinates · Site log
P51334.9073, -120.6502Coordinates · Site log
P51635.1062, -120.3834Coordinates · Site log
P52134.8886, -119.8154Coordinates · Site log
P52335.3045, -120.8603Coordinates · Site log
P52635.6360, -120.8697Coordinates · Site log
P53235.6338, -120.2670Coordinates · Site log
P53437.0612, -122.2376Coordinates · Site log
P53935.7027, -120.1821Coordinates · Site log
P54435.7313, -119.7380Coordinates · Site log
P55434.7923, -118.8480Coordinates · Site log
P56034.8218, -118.5409Coordinates · Site log
P56335.4187, -119.4212Coordinates · Site log
P56535.7439, -119.2367Coordinates · Site log
P56636.3244, -119.2293Coordinates · Site log
P56735.4209, -118.7536Coordinates · Site log
P57236.5855, -118.9546Coordinates · Site log
P58234.6343, -117.5489Coordinates · Site log
P58433.8926, -116.9516Coordinates · Site log
P59135.1524, -118.0165Coordinates · Site log
P59235.2385, -117.3032Coordinates · Site log
P59435.8967, -117.3901Coordinates · Site log
P59834.1925, -116.7103Coordinates · Site log
P60235.7292, -120.2279Coordinates · Site log
P60334.7169, -116.0295Coordinates · Site log
P61034.4258, -115.7637Coordinates · Site log
P61135.2048, -115.6498Coordinates · Site log
P61434.7318, -115.2503Coordinates · Site log
P61535.2046, -116.7629Coordinates · Site log
P61935.5260, -116.1218Coordinates · Site log
P62135.4728, -115.5439Coordinates · Site log
P62334.1889, -114.5994Coordinates · Site log
P62534.8444, -114.9651Coordinates · Site log
P63037.6130, -119.0004Coordinates · Site log
P63637.9628, -119.1467Coordinates · Site log
P65037.8913, -118.5549Coordinates · Site log
P65137.5631, -118.3870Coordinates · Site log
P67140.4091, -121.4282Coordinates · Site log
P67441.6163, -121.4900Coordinates · Site log
P73041.3592, -120.8282Coordinates · Site log
P73141.3325, -120.4728Coordinates · Site log
P78441.8308, -122.4205Coordinates · Site log
P78641.8455, -123.9808Coordinates · Site log
PLSB38.6850, -121.7626Coordinates · Site log
PTSG41.7827, -124.2552Coordinates · Site log
QUIN39.9746, -120.9444Coordinates · Site log
RDMT34.6439, -116.6247Coordinates · Site log
S30037.6665, -121.5583Coordinates · Site log
SACR38.6550, -121.3542Coordinates · Site log
SBCC33.5530, -117.6615Coordinates · Site log
SCIP32.9144, -118.4879Coordinates · Site log
SFDM34.4598, -118.7545Coordinates · Site log
SHIN40.5917, -120.2250Coordinates · Site log
SIO532.8407, -117.2497Coordinates · Site log
SKYB34.4386, -118.4786Coordinates · Site log
SLAC37.4165, -122.2043Coordinates · Site log
SLMS33.2922, -115.9778Coordinates · Site log
SNI133.2479, -119.5244Coordinates · Site log
SRS134.0043, -120.0652Coordinates · Site log
SUTB39.2058, -121.8206Coordinates · Site log
TIBB37.8909, -122.4476Coordinates · Site log
TJRN34.4835, -120.1326Coordinates · Site log
TORP33.7978, -118.3306Coordinates · Site log
TOST34.2480, -118.8367Coordinates · Site log
TRAK33.6179, -117.8034Coordinates · Site log
TRND41.0539, -124.1509Coordinates · Site log
USGC33.0301, -116.0853Coordinates · Site log
VDCY34.1786, -118.2200Coordinates · Site log
VNDP34.5563, -120.6165Coordinates · Site log
WINT37.6526, -122.1406Coordinates · Site log
ZLA134.6035, -118.0839Coordinates · Site log
ZOA137.5431, -122.0160Coordinates · Site log
  • Download: daily RINEX files (a standard GPSThe US satellite navigation system. People often use "GPS" to mean all satellite positioning.Full definition file type) at geodesy.noaa.gov/corsdata/rinex/YYYY/DDD/ssss/ or the AWS mirror. Custom time spans are available from UFCORS.
  • How often it records: after 30 days, NGS thins daily files to one reading every 30 seconds. Full-rate data is available from NOAA NCEI CLASS.
  • Set your own base: OPUS. See our OPUS how-to.
PPK how-to →OPUS how-to
Source: NGS CORS data access · station list from NGS ITRFInternational Terrestrial Reference Frame. A worldwide datum. In the US it's about a meter different from NAD 83.Full definition coordinate file (Oct 14, 2026).

Reliability reports

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Quick answers

Is there a free RTK network in California?

No free statewide network is listed for California. The state network, California Real Time Network (CRTN), is paid. Paid nationwide services and the free community caster RTK2GO are the main options.

How many RTK correction options are there in California?

FixFinder lists 26: 1 state-run network, 2 regional or private network(s), and 23 nationwide services.

How much does California Real Time Network (CRTN) cost?

1 account per organization: $100 one-time registration contribution; more access through a $1,000/yr data contribution

What is the NTRIP caster for California Real Time Network (CRTN)?

The operator gives the caster address after you register. FixFinder has not found it published.

Nearby states and related pages

Arizona RTK networksFreeNevada RTK networksPaidOregon RTK networksFreeAZGPS GNSS NetworkRegionalCaltrans RTNs (District 6 and others)RegionalFree vs paid RTK networksHow-toNTRIP setup guidesHow-to

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