DATA CHECKED OCT 2026
All states / Alaska

RTK corrections in Alaska

Free  25 options · ACORN (Alaska CORSContinuously Operating Reference Station. A permanent GPS receiver that records satellite data all day, every day.Full definition Network) · Alaska DOTDepartment of Transportation. The state agency that runs many of the free state RTK networks.Full definition&PF · 1 regional/private network(s)

Compare all 25 RTK options in Alaska

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
ACORN (Alaska CORS Network)
State-run network
FreeFree (registration required)—www.acorn-gnss.net:2101Nearest single base and regional VRSVirtual reference station. The network blends nearby stations to create a pretend base right next to you, which keeps the baseline short.Full definitionAlaska DOT&PF2026-10-17
Frontier VRS
Regional private (dealer)
PaidNot published—After signupNot publishedFrontier Precision. Anchorage region only2026-10-16
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)94 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 ↓—

ACORN (Alaska CORS Network)

Free
Operator
Alaska DOT&PF
Access
Free
Price
Free (registration required)
Coverage
Alaska

NTRIP caster

hostwww.acorn-gnss.net
PortA number that tells your device which "door" on the caster server to use. For NTRIP it's often 2101.Full definition2101
protocolNTRIP
New find. Coverage is regional (Southcentral, Interior, Southeast VRS). Free status and caster come from a state presentation; the operator site loads but we didn't read its terms.
Sign up / request access →Network info & station mapFull network details →
Partially verifiedChecked 2026-10-16 · operator source · Sources: [1]

PPK with NOAA CORS in Alaska

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 94 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.

JuneauKodiakKetchikanSitkaUtqiaġvikKodiakUtqiaġvikAB02AB04AB06AB07AB08AB09AB11AB14AB15AB17AB18AB21AB22AB27AB28AB33AB36AB37AB39AB41AB42AB43AB44AB45AB46AB48AB49AB50AB51AC07AC08AC09AC10AC13AC17AC19AC23AC24AC25AC26AC27AC29AC31AC37AC38AC39AC40AC42AC43AC45AC47AC48AC50AC51AC52AC57AC58AC60AC61AC62AC63AC67AC71AC72AC74AC75AC76AC78AC79AKSEAKSIANC2AT01ATW2AV09BET1BRW1CDB8CLGODSL1EDOCFAI1FAIRGCGOGRNXJNU1MCESOTZ1SELDTBONTLK2WIKRZAN1ZINA
Tap or hover a dot: — NOAA CORS station   City
94 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
AB0252.9706, -168.8547Coordinates · Site log
AB0463.6569, -170.5674Coordinates · Site log
AB0654.8853, -163.4235Coordinates · Site log
AB0755.3493, -160.4768Coordinates · Site log
AB0860.3848, -166.2009Coordinates · Site log
AB0965.6150, -168.0621Coordinates · Site log
AB1164.5645, -165.3735Coordinates · Site log
AB1459.1082, -159.0915Coordinates · Site log
AB1561.0397, -159.8784Coordinates · Site log
AB1763.8864, -160.6947Coordinates · Site log
AB1866.8584, -162.6135Coordinates · Site log
AB2151.8642, -176.6627Coordinates · Site log
AB2259.8993, -154.6983Coordinates · Site log
AB2767.0559, -156.9049Coordinates · Site log
AB2862.0938, -152.8149Coordinates · Site log
AB3367.2510, -150.1726Coordinates · Site log
AB3665.0304, -150.7440Coordinates · Site log
AB3762.9673, -145.4519Coordinates · Site log
AB3966.5593, -145.2126Coordinates · Site log
AB4164.7773, -141.1581Coordinates · Site log
AB4259.3404, -138.8988Coordinates · Site log
AB4358.1988, -136.6408Coordinates · Site log
AB4459.5280, -135.2283Coordinates · Site log
AB4568.7605, -148.8712Coordinates · Site log
AB4668.1207, -145.5679Coordinates · Site log
AB4856.2451, -134.6470Coordinates · Site log
AB4955.5801, -133.0685Coordinates · Site log
AB5058.4168, -134.5453Coordinates · Site log
AB5156.7976, -132.9136Coordinates · Site log
AC0765.9613, -161.2866Coordinates · Site log
AC0858.9288, -153.6447Coordinates · Site log
AC0959.8685, -144.5239Coordinates · Site log
AC1054.5226, -164.8867Coordinates · Site log
AC1355.8219, -155.6224Coordinates · Site log
AC1760.6639, -152.4039Coordinates · Site log
AC1962.5192, -153.6073Coordinates · Site log
AC2360.4751, -150.8780Coordinates · Site log
AC2458.6816, -156.6528Coordinates · Site log
AC2555.0890, -162.3141Coordinates · Site log
AC2658.2146, -154.1503Coordinates · Site log
AC2759.2525, -154.1629Coordinates · Site log
AC2959.4296, -146.3400Coordinates · Site log
AC3164.6380, -162.2391Coordinates · Site log
AC3760.4397, -153.8654Coordinates · Site log
AC3857.7537, -153.3419Coordinates · Site log
AC3958.6097, -152.3941Coordinates · Site log
AC4056.9303, -158.6186Coordinates · Site log
AC4254.4718, -162.7836Coordinates · Site log
AC4359.5213, -149.6287Coordinates · Site log
AC4556.5645, -154.1810Coordinates · Site log
AC4760.0814, -152.6240Coordinates · Site log
AC4860.6459, -147.3430Coordinates · Site log
AC5065.5538, -164.5666Coordinates · Site log
AC5161.4981, -151.8354Coordinates · Site log
AC5257.5673, -157.5742Coordinates · Site log
AC5761.1386, -145.7427Coordinates · Site log
AC5857.1561, -170.2178Coordinates · Site log
AC6052.7146, 174.0763Coordinates · Site log
AC6164.0293, -142.0759Coordinates · Site log
AC6263.0836, -146.3127Coordinates · Site log
AC6363.5024, -145.8473Coordinates · Site log
AC6757.7907, -152.4254Coordinates · Site log
AC7164.0493, -145.7136Coordinates · Site log
AC7263.6951, -145.8877Coordinates · Site log
AC7463.4644, -148.8073Coordinates · Site log
AC7562.9993, -149.6088Coordinates · Site log
AC7663.0400, -143.2588Coordinates · Site log
AC7863.1135, -142.0279Coordinates · Site log
AC7959.9979, -147.4031Coordinates · Site log
AKSE60.1325, -149.4365Coordinates · Site log
AKSI57.0489, -135.3390Coordinates · Site log
ANC261.1752, -149.9834Coordinates · Site log
AT0163.4840, -162.0064Coordinates · Site log
ATW261.5977, -149.1323Coordinates · Site log
AV0953.8756, -166.5418Coordinates · Site log
BET160.7879, -161.8417Coordinates · Site log
BRW171.2828, -156.7899Coordinates · Site log
CDB855.1924, -162.7064Coordinates · Site log
CLGO64.8738, -147.8605Coordinates · Site log
DSL170.3334, -148.4727Coordinates · Site log
EDOC70.3103, -148.3185Coordinates · Site log
FAI164.8096, -147.8473Coordinates · Site log
FAIR64.9780, -147.4992Coordinates · Site log
GCGO64.9781, -147.4994Coordinates · Site log
GRNX63.8355, -148.9782Coordinates · Site log
JNU158.3626, -134.5857Coordinates · Site log
MCES59.7461, -151.2578Coordinates · Site log
OTZ166.8873, -162.6114Coordinates · Site log
SELD59.4457, -151.7067Coordinates · Site log
TBON61.1797, -149.7851Coordinates · Site log
TLK268.6280, -149.5954Coordinates · Site log
WIKR63.5527, -150.9222Coordinates · Site log
ZAN161.2292, -149.7802Coordinates · Site log
ZINA61.3835, -143.0241Coordinates · 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).

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Quick answers

Is there a free RTK network in Alaska?

Yes. ACORN (Alaska CORS Network) is listed as free. Registration is required.

How many RTK correction options are there in Alaska?

FixFinder lists 25: 1 state-run network, 1 regional or private network(s), and 23 nationwide services.

How much does ACORN (Alaska CORS Network) cost?

Free (registration required)

What is the NTRIP caster for ACORN (Alaska CORS Network)?

Host www.acorn-gnss.net, port 2101. You get your username, password and mount point when you register.

Related pages

Frontier VRSRegionalFree vs paid RTK networksHow-toNTRIP setup guidesHow-to

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