State-run network
Free
Mesa County (local, western CO only)
Good to know: Not published
Where it works
1 stateState-run network for Colorado.
All plans
| Plan | Price | Term |
|---|---|---|
| Public access | Free |
Coverage
- Where it works
- Mesa County / western Colorado
- Stations
- 33 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 (17 are NGSNational Geodetic Survey. The part of NOAA that runs the official US coordinate system, CORS and OPUS.Full definition CORSContinuously Operating Reference Station. A permanent GPS receiver that records satellite data all day, every day.Full definition)
- 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
hostrtvrn.mesacounty.us
PortA number that tells your device which "door" on the caster server to use. For NTRIP it's often 2101.Full definition2101
mountsVRS_CMR, VRS_RTCMv3, VRS_CMRx, VRS_CMR_RTX, VRS_CMRx_RTX, VRS_RTCMv3_RTX
Confirmed live: a public SourcetableThe list of every mount point a caster offers. Your app shows it when you connect without picking one.Full definition request to rtvrn.mesacounty.us:2101 answered on Oct 17, 2026 with 6 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
- Correction formats
- CMRxTrimble's own compact correction format. Some networks offer it for Trimble gear and machine control.Full definition, CMRx, RTCMThe common format RTK corrections are written in, so different brands can understand each other.Full definition.1, RTCM 3.4 (RTX mounts)
- 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; GPS+GLONASS+Galileo+BeiDou on _RTX 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
- 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.
Sign-up steps
No step-by-step guide is published. Start at the sign-up page.
- Sign-up page
- Go to sign-up →
Fine print
- Last checked
- Oct 17, 2026
County network (western CO only). Operator sensor map currently shows 0 sensors and the register page errors, so it may be offline.
States covered1
Not listed by the operator: free trial, discounts, what's included, a coverage map 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.