All states / Alabama
RTK in Alabama
26 ways to get CorrectionsLive info from a base station about how far off the satellite signals are, so your rover can cancel out the error.Full definition, from free state networks to nationwide services.
Best option for most people in Alabama
ALDOT CORS (AL)
Free
A free network for everyone in Alabama. You register once, then connect your own receiver.
Good to know: Registration is required.
Other options
Local paid networks
- Trimble VRS Now (mapped states)Price not published
- iNET Reference Station NetworkPrice not published
Nationwide services
- GEODNET RTK$400/yr
- RTKdata$400/yr
- Swift Skylark (Nx RTK)$699/yr
Show all 26 options
Compare all 26 RTK options in Alabama
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 corrections 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 →
| Option | Access | Price | Free trial | Caster | Mount types | |
|---|---|---|---|---|---|---|
| ALDOT CORS State-run network | Free | Free (registration required) | — | 205.172.52.26:10011 | Nearest single station (NEAR_MSM4); older per-station RTCMThe common format RTK corrections are written in, so different brands can understand each other.Full definition mounts… | |
| Trimble VRS Now (mapped states) Commercial network | Paid | Not published (buy through Trimble dealers or the Trimble store) | — | www.vrsnow.us:2101 | — | |
| iNET Reference Station Network Regional private (dealer) | Paid | Not published (yearly, monthly and short-term plans; site licenses for multiple machines) | Free trial: call 205-595-3796 | After signup | — | |
| Point One Navigation Polaris Commercial network | Paid | Virtual RTK $42/mo per license (~10 cm); True RTK $125/mo per license (1-3 cm); annual discounts | 14 days, no credit card required; includes Virtual RTK or… | polaris.pointonenav.com:2101 | — | |
| GEODNET RTK Community network | Paid | $40/mo or $400/yr per device | Free RTK trial offered (link on store page) | rtk.geodnet.com:2101 | Nearest single base | |
| RTKdata Commercial network | Paid | $40/mo, $400/yr, or $1,920 for 5 yrs per device | 30 days, full service, no credit card, no auto-renew | rtk.rtkdata.com:2101 | Nearest single base | |
| E38 RTK Premium Reseller | Paid | From $100 (shortest term; see page for durations) | — | rtkpremium.xyz:2101 | — | |
| Emlid Corrections Commercial network | Paid | 1 yr included with eligible Reach receivers; top-up $699/1 yr or $1,199/3 yr per device (via E38) | — | Not needed (built in) | — | |
| u-blox PointPerfect Flex Commercial network | Paid | From $5.90/mo (up to 100 hrs); 30-day free trial | 30-day free trial (u-blox and non-u-blox receivers) | ppntrip.services.u-blox.com:2101 | — | |
| Swift Navigation Skylark Commercial network | Paid | From $69/mo (1 cm RTK) or $29/mo (sub-decimeter RTK-SSR) per ArduSimple | 14 days | na.l1l2:2101 | — | |
| Leica (HxGN) SmartNet Commercial network | Paid | Not published | — | <state:9301 | iMAX network, nearest single base | |
| Trimble VRS Now Commercial network | Paid | Not published | — | www.vrsnow.us:2101 | — | |
| Topcon Topnet Live Commercial network | Paid | $1,800 new US subscription (Topcon store); monthly/project terms via dealers | — | After signup | — | |
| Carlson SkyNet RTN Commercial network | Paid | $1,500/yr; 14-day free trial | 14 days | After signup | — | |
| 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 | Free | Free community caster; no quality guarantees | — | rtk2go.com:2101 | — | |
| NOAA NGS CORS Post-processing data | Free | Free 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 | — | None (data download) | — | |
| Onocoy Nationwide / community | Paid | $20 per 30 days + $0.15/hr used | — | clients.onocoy.com:2101 | Nearest single base | |
| EarthScope NOTA real-time streams Nationwide / scientific | Free | Free for non-commercial use; commercial license required | — | ntrip.earthscope.org:2101 | Single base (you pick a station) | |
| Emlid Caster Free relay for your own base | Free | Free (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:2101 | Your own base (single base) | |
| Trimble CenterPoint RTX Nationwide / satellite PPP | Paid | $1,150/yr (US dealer listing) | — | Not needed (built in) | PPP (RTX), delivered by L-band satellite or internet | |
| 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) | — | Not needed (built in) | — | |
| NovAtel TerraStar Nationwide / satellite PPP | Paid | Not published (dealer quote) | — | sid-output.com:2101 | PPP corrections by L-band satellite or internet | |
| John Deere RTK Ag network (dealer) | Paid | Not published (dealer); forum reports ~$1,250-$1,500/machine/yr | — | Not NTRIP (built in) | — | |
| Case IH AFS RTK+ Ag network (dealer) | Paid | $838.10/yr (dealer listing) | — | After signup | — | |
| New Holland PLM RTK+ Ag network (dealer) | Paid | Not published (dealer subscription) | — | After signup | — | |
| IGS real-time streams (IGS-IP / BKG) Scientific network | Free | Free (registration required) | — | igs-ip.net:2101 | Single global stations (raw data) and SSR products for real-time PPP | |
| NOAA CORS (NCN) | Free Post-processing only | Free | — | No caster (download files) | Post-processing (RINEX) | — |
A dash means the operator doesn't publish it. Listings checked Oct 16–17, 2026.
State network details
ALDOT CORS
Free- Operator
- Alabama DOT
- Access
- Free
- Price
- Free (registration required)
- Coverage
- Alabama
NTRIP caster
casterProvided by the operator after registration
Conflict resolved: operator SBC lists 'ALL RT Products' with no price; no payment step. Caster details are given after login.
Post-process with free NOAANational Oceanic and Atmospheric Administration. The US agency that includes NGS and runs the CORS network.Full definition base stations
PPK with NOAA CORS in Alabama
NOAA'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 36 working stations. 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.
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
List of stations36
| Station ID | Lat, Lon | NGS links |
|---|---|---|
| AL30 | 33.5324, -86.8534 | Coordinates · Site log |
| AL35 | 33.1651, -86.7568 | Coordinates · Site log |
| AL50 | 33.1680, -87.5015 | Coordinates · Site log |
| AL60 | 32.4114, -86.2706 | Coordinates · Site log |
| AL62 | 32.1482, -85.6868 | Coordinates · Site log |
| AL76 | 31.8750, -85.2257 | Coordinates · Site log |
| AL81 | 32.5757, -88.1818 | Coordinates · Site log |
| AL82 | 32.2574, -87.6258 | Coordinates · Site log |
| AL84 | 31.7004, -87.7892 | Coordinates · Site log |
| AL90 | 30.6908, -88.0317 | Coordinates · Site log |
| AL92 | 30.9164, -87.7757 | Coordinates · Site log |
| ALA1 | 32.5989, -85.5039 | Coordinates · Site log |
| ALAN | 31.3074, -86.4840 | Coordinates · Site log |
| ALAS | 33.6670, -85.8307 | Coordinates · Site log |
| ALBE | 34.4754, -87.8646 | Coordinates · Site log |
| ALBU | 32.0816, -88.2332 | Coordinates · Site log |
| ALCE | 32.9460, -87.1506 | Coordinates · Site log |
| ALCL | 32.8399, -86.6298 | Coordinates · Site log |
| ALCN | 34.1630, -85.6586 | Coordinates · Site log |
| ALCU | 34.1799, -86.8449 | Coordinates · Site log |
| ALDI | 30.2492, -88.0780 | Coordinates · Site log |
| ALDO | 31.2395, -85.4402 | Coordinates · Site log |
| ALDS | 34.1482, -87.4049 | Coordinates · Site log |
| ALFA | 33.6852, -87.8293 | Coordinates · Site log |
| ALFO | 30.4170, -87.6751 | Coordinates · Site log |
| ALHL | 33.8876, -86.3979 | Coordinates · Site log |
| ALJA | 33.8319, -87.2776 | Coordinates · Site log |
| ALLA | 32.9174, -85.4005 | Coordinates · Site log |
| ALMJ | 31.0290, -88.2297 | Coordinates · Site log |
| ALNB | 31.3775, -85.9160 | Coordinates · Site log |
| ALNC | 34.6813, -87.3094 | Coordinates · Site log |
| ALRE | 31.4113, -87.2343 | Coordinates · Site log |
| ALSE | 32.4474, -87.0118 | Coordinates · Site log |
| ALTA | 33.4235, -86.1212 | Coordinates · Site log |
| ALTU | 31.8002, -85.9543 | Coordinates · Site log |
| GTAC | 34.7111, -86.6534 | Coordinates · 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.
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 Alabama?
Yes. ALDOT CORS is listed as free. Registration is required.
How many RTK correction options are there in Alabama?
FixFinder lists 26: 1 state-run network, 2 regional or private networks, and 23 nationwide services.
How much does ALDOT CORS cost?
Free (registration required)
What is the NTRIP caster for ALDOT CORS?
Host 205.172.52.26, port 10011. You get your username, password and mount point when you register.