Find RTK corrections where you work.

RTKReal-time kinematic. A way to make GPS accurate to about an inch by getting live corrections from a nearby base station.Full definition makes GPSThe US satellite navigation system. People often use "GPS" to mean all satellite positioning.Full definition accurate to about an inch. Type your state, ZIP or address to see the free and paid correction services there, with prices and setup details.

Free option (22)Free for residents (1)Paid only (27)NOAA CORSCentipede-RTKRTK2go

1,701 public base stations. See the ones closest to you, in miles.

Spots from NOAA CORS (NOAA does not endorse FixFinder), Centipede-RTK (ODbL 1.0) and RTK2go (list as of Oct 28, 2026).

Seen on: SideProjectors (featured) · TinyLaunch · Emlid Community (New User of the Month)

Free or paid, state by state

22 states have a free network for everyone, plus Maine for residents. Tap a state on the map at the top for its options.

Find the closest free and paid networks to where you work. Find networks near me

Working near a state line? Check your exact spot

Work in more than one state?

Nationwide services use one login everywhere you have cell signal. Prices are the lowest each operator publishes, per 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.

All 22 nationwide services

Compare them side by side

All 50 states

The label shows the best access you can get there: Free means a free network exists.

AlabamaFreeAlaskaFreeArizonaFreeArkansasFreeCaliforniaPaidColoradoFreeConnecticutFreeDelawarePaidFloridaFreeGeorgiaPaidHawaiiPaidIdahoPaidIllinoisFreeIndianaFreeIowaFreeKansasPaidKentuckyFreeLouisianaPaidMaineFreeMarylandPaidMassachusettsFreeMichiganFreeMinnesotaFreeMississippiFreeMissouriFreeMontanaPaidNebraskaPaidNevadaPaidNew HampshirePaidNew JerseyPaidNew MexicoPaidNew YorkFreeNorth CarolinaPaidNorth DakotaPaidOhioFreeOklahomaPaidOregonFreePennsylvaniaPaidRhode IslandFreeSouth CarolinaPaidSouth DakotaPaidTennesseePaidTexasPaidUtahPaidVermontFreeVirginiaPaidWashingtonPaidWest VirginiaFreeWisconsinPaidWyomingPaid
Who covers which states?

Pick a network to see the states on its published list. Services that don't publish a list are marked, and we don't guess for them.

Tap a network below to light up the states it lists. Yellow = state is on the network's list (coverage inside a state can still be partial).
Regional / private
State-run
Nationwide (dashed = no state list published)
Regional and private networks20

Networks run by companies, equipment dealers or volunteers that cover a few states.

Nationwide services in detail22
Free field tools

Price changes and new stations, every two weeks.

New state networks, price changes and plain-language RTK tips. One short email every two weeks, no spam.

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