State-run network
$50/mo
Tennessee DOTDepartment of Transportation. The state agency that runs many of the free state RTK networks.Full definition
Good to know: $50/mo per simultaneous access point + 2.35% card fee (older FY25 contract: $150 processing + $25/mo)
Where it works
1 stateState-run network for Tennessee.
All plans
| Plan | Price | Term |
|---|---|---|
| Access point | $50/mo per simultaneous access point | Licensed; renew in portal |
- Discounts / exemptions
- None published; 2.35% card convenience charge added
- What's included
- RTKReal-time kinematic. A way to make GPS accurate to about an inch by getting live corrections from a nearby base station.Full definition products plus Coordinate Computation Service and Virtual RINEXA standard file format for raw GPS data. Any brand of receiver or software can read it.Full definition Service
Coverage
- Where it works
- State-run network for Tennessee.
- Stations
- Not published; the public SourcetableThe list of every mount point a caster offers. Your app shows it when you connect without picking one.Full definition listed 18 mountpoints on Oct 17, 2026 (network products plus any single-station streams)
- Needs cell signal?
- Yes: NTRIPThe standard way RTK corrections are sent over the internet. Think of it as internet radio for correction data.Full definition needs internet at the 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 (cell data or a phone hotspot). General rule, not an operator statement.
Connection settings
NTRIP caster
hostTDOTCORS.TN.GOV
PortA number that tells your device which "door" on the caster server to use. For NTRIP it's often 2101.Full definition8002
mountsMSM_NEAR_CORS96, RTCM3_NEAR_CORS96, CMR+_NEAR_CORS96, MSM_IMAX_CORS96, MSM_VRS_CORS96, RTCM3_IMAX_CORS96, RTCM3_VRS_CORS96, CMR+_IMAX_CORS96, CMR+_VRS_CORS96, CMR+_NEAR, RTCM3_NEAR, MSM_NEAR, CMR+_VRS, CMR+_IMAX … (18 in total)
Confirmed live: a public sourcetable request to TDOTCORS.TN.GOV:8002 answered on Oct 17, 2026 with 18 mountpoints.
- Mount types
- VRSVirtual reference station. The network blends nearby stations to create a pretend base right next to you, which keeps the baseline short.Full definition, iMAX (network) and NEAR (nearest single base)
- Correction formats
- RTCMThe common format RTK corrections are written in, so different brands can understand each other.Full definition.2 MSMMultiple Signal Messages. A newer kind of RTCM 3 message that carries all satellite systems and signals.Full definition, RTCM 3, CMRxTrimble's own compact correction format. Some networks offer it for Trimble gear and machine control.Full definition
- Satellites (ConstellationOne family of navigation satellites, like GPS, GLONASS, Galileo or BeiDou. More constellations means more satellites to use.Full definition)
- GPSThe US satellite navigation system. People often use "GPS" to mean all satellite positioning.Full definition, GLONASS, Galileo, BeiDou (MSM mounts)
- Datum / EpochOne moment of GPS measurement. A receiver logging at 1 Hz records one epoch every second.Full definition / GeoidA lumpy, imaginary "sea level" surface around the whole Earth. Elevations are measured from it.Full definition
- NAD 83(2011)The official US datum for horizontal position right now. Most state networks give coordinates in it.Full definition epoch 2010.00 (MYCS2) and NAD83(CORS96) epoch 1996.00 mounts
- Must send GGAA short message your rover sends with its rough location. VRS and nearest-station streams need it to know where you are.Full definition position?
- Yes for VRS / network / nearest-base mountpoints (your rover must send its position as an NMEAA common text format GPS receivers use to report position and status. GGA is one NMEA message.Full definition GGA message). General rule based on the mount types.
- Accuracy
- Example in TDOT FAQ: about 1.8 cm horizontal (network RTK, 20 km) vs 2.8 cm (single base)
Sign-up steps
- Buy a license at portal.tndot.net
- Get the activation email with portal login
- Accept TDOT terms in the portal
- Copy the rover username and password from License Management
- Connect to TDOTCORS.TN.GOV:8002
- Sign-up page
- Go to sign-up →
Fine print
- Terms / user agreement
- Read terms →
- Support
- [email protected]
- Last checked
- Oct 17, 2026
Two TDOT documents disagree; the newer FAQ (10/2025) is used.
States covered1
Not listed by the operator: free trial, a coverage map, supported receivers, approval time and a few other details. Ask them before you sign up if these matter to you.
No user reliability reports yet. Used it in the field? Tell us how it went.