NTRIPThe standard way RTK corrections are sent over the internet. Think of it as internet radio for correction data.Full definition is the standard way RTK CorrectionsLive info from a base station about how far off the satellite signals are, so your rover can cancel out the error.Full definition travel over the internet. The name stands for Networked Transport of RTCMThe common format RTK corrections are written in, so different brands can understand each other.Full definition via Internet Protocol. RTCM is just the common format the corrections are written in.
BKG, the German agency that helped create NTRIP, says it has three parts:
- Servers send data from the 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.
- A CasterThe internet server that hands out correction streams. Your rover logs in to it, like tuning into a radio station.Full definition collects it and hands it out. Think of it as a radio station tower.
- Clients receive it. Your 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 or drone controller is the client, like a radio tuned to one channel.
The boxes you fill in
- Caster host
- The server's address. It looks like a web address or a string of numbers.
- Port
- Which "door" on the server to use. It is very often 2101, but use whatever your provider tells you.
- Mount pointOne specific correction stream on a caster, like one channel on a radio. Each one comes from a certain station or network setup.Full definition
- The channel you tune to. It might be one station, the nearest station, or a VRSVirtual reference station. The network blends nearby stations to create a pretend base right next to you, which keeps the baseline short.Full definition (a "virtual" station made just for you). Each channel has its own format, such as RTCM 3 MSMMultiple Signal Messages. A newer kind of RTCM 3 message that carries all satellite systems and signals.Full definition, and its own list of satellite systems.
- Username and password
- Your login from the network. Even free state networks usually make you sign up.
SourcetableThe list of every mount point a caster offers. Your app shows it when you connect without picking one.Full definition: if you connect without picking a mount point, the caster sends back a list of every channel it has. Many apps show this as a drop-down menu.
GGAA short message your rover sends with its rough location. VRS and nearest-station streams need it to know where you are.Full definition: VRS and "nearest station" channels need to know roughly where you are. Your rover tells them by sending a short message called an NMEAA common text format GPS receivers use to report position and status. GGA is one NMEA message.Full definition GGA sentence. If a VRS channel sends you nothing, check that GGA is turned on.
Each state page lists the network's caster host and PortA number that tells your device which "door" on the caster server to use. For NTRIP it's often 2101.Full definition when the network publishes them. Start from the state map, then follow the receiver setup guides.