Free RTK corrections delivered through NTRIP.
Supporting GPS, GLONASS, GALILEO and BeiDou.
LIVE STATUS and UPTIME data
#1 Centipede:
Status: Available
Centipede RTK is a French collaborative network of open GNSS bases and available to anyone in the coverage area. The network is extended by public institutes, individuals, private actors such as farmers or other public partners. It is financially supported by: INRAE – National Research Institute for Agriculture, Food and the Environment (France)
Hostname: crtk.net
IP: 66.185.123.66
Port: 2101
Username: c or centipede
Password: c or centipede
Mount Point: GURAN
Location: Lier, NOR
Level: RTCM 3.3 (MSM 7)
Satellites: GPS+GLO+GAL+BDS+SBS
Messages:
1004(1), 10005(10), 1008(10), 1012(1), 1019(3), 1020(2), 1033(10), 1042(3), 1046(3), 1077(1), 1087(1), 1097(1), 1107(1), 1127(1), 1230(30)
Documentation
The documentation for Centipede are in French so use Google Translate.
#2 RTKdata:
Status: Available
RTKdata.online – free NTRIP caster
You can select existing reference station streaming RTCM data to RTKdata.online or set up your own station and connect it to our NTRIP caster free of charge.
Hostname: rtkdata.online
IP: 82.146.60.24
Port: 10586
Username: none (empty)
Password: none (empty)
Mount Point: GURAND
Location: Lier, NOR
Level: RTCM 3.3 (MSM 7)
Satellites: GPS+GLO+GAL+BDS+SBS
Messages:
1004(1), 10005(10), 1008(10), 1012(1), 1019(3), 1020(2), 1033(10), 1042(3), 1046(3), 1077(1), 1087(1), 1097(1), 1107(1), 1127(1), 1230(30)
Documentation
The documentation for RTKdata.
#3 Gurandsrud Direct
Status: Available
Use this for John Deere SF 3000/6000
Mount Point: GURANJD
Location: Lier, NOR
Level: RTCM 3.2 (Legacy)
Satellites: GPS+GLO
Messages:
1004(1), 1006(30), 1008(10), 1012(1), 1019(2), 1020(2), 1033(30), 1230(30)
Hostname: caster.gurandsrud.no
IP:193.212.227.98
Port: 2101
Username: gurand
Password: gurand
How to connect
Here are some different guides/videos of different rover setups:
Connection Details
Note that when you enter the mount point, capitalisation matters; make sure it’s exactly as stated. All mount points use the same message set, with the exception of GURANJD via Direct, which is typically for John Deere.
Usually, you can put hostname instead of IP address. Some machines will only allow IP address. Using hostname is preferred, just in case the IP changes, however.
Docs: Ntrip – Networked Transport of RTCM via Internet Protocol
Calibration & Accuracy
The location of the base station is calibrated using data from both GPS and GLONASS. After 48 hours of logging, the data is submitted to NRCan’s Canadian Spatial Reference System Precise Point Positioning (CSRS-PPP). With a FINAL NRCan/IGS report from the CSRS-PPP service the accuracy of base station’s location is +/- 2 cm. Coordinates from NRCan are converted from ITRF20 to ETRF89.
The standard deviation (95%) for position of the base station is:
Latitude (+N): 2 mm
Longitude (+E): 2 mm
Ellipsoidal Height: 5 mm
The Canadian Spatial Reference System (CSRS) PPP service is provided by Natural Resources Canada’s Canadian Geodetic Survey. It uses single or dual-frequency GPS and GLONASS data for solution computation and supports both Static and Kinematic modes. It uses precise satellite orbit, clock and bias corrections derived from a global network of receivers to determine accurate user positions anywhere on the globe, regardless of proximity to reference stations.
RTK (Real-time kinematic positioning) provides best accuracy enhancements up to about 20 km radius from the base station. Can also be used up to about 50 km radius, but with less accuracy. The typical nominal accuracy for these systems is 1 centimetre ± 1 ppm (parts-per-million) horizontally and vertically.
Example: 1cm + 1mm of error in per 1000 meter distance between the Base station and the Rover
Bill of Materials
Total costs for all materials building this base station was ~5000 NOK ex. VAT
| Supplier | Part |
|---|---|
| Ardusimple | Ardusimple Survey GNSS Multiband antenna (IP66) |
| Ardusimple | Ardusimple simpleRTK2B Budget – ublox ZED-F9P |
| Dustin | Rasberry Pi 3 Mod B+ |
| Dustin | SanDisk Ultra 32GB microSDHC UHS-I Memory Card |
| Dustin | Direktronik Gigabit PoE Splitter MicroUSB 5V/2A |
| Dustin | Direktronik PoE Injector 15W 802.3AF |
| Dustin | USB 2.0 Cable Type A-B Micro Male-Male 0.5m |
| Dustin | Network cable RJ-45 CAT 5e 0.3m Black |
| Blinken | Prism bracket. Threads 5/8″ |
| Blinken | Extender for crank stand. Threads 5/8″ female/male |
| Bauhaus | Pipe fastener, 40mm |
| Biltema | Flexpipe, 11 mm |
| Elektroimportøren | Junction box OBO T250 IP66 |
Guides
Want to set up your own base station? Here are some guides.
- How to set up your own RTK base station
- Make an RTK base (French, so use Google Translate)
- GNSS Reference Station – Best practices, installation and operation
Powered by:
RTKbase – Centipede – RTKdata
Uptime Kuma – NRCan CSRS-PPP – AgOpenGPS
Software used are either Open Source or free of charge.