Learn
RTK, GNSS and RINEX — in plain language. After reading, get hands-on with the free tools or the map.
📡Basics
What is RTK?
Why ordinary GPS is off by metres, yet you can measure to centimetres. Base stations, carrier phase, NTRIP, Fix/Float and QZSS CLAS.
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🛰Basics
What is RINEX?
The standard format for raw GNSS observations. The difference from NMEA (the answer), .obs/.nav, Hatanaka compression, and use in PPK/PPP post-processing.
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🌐Basics
GNSS vs GPS
GPS is the name of one system; GNSS is the umbrella term. GLONASS, Galileo, BeiDou, QZSS, and the benefits of multi-GNSS.
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🔗Basics
What is NTRIP?
How base-station corrections reach you over the internet. Caster, mountpoint, client and the connection flow.
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Coming soon
- Coordinate-system basics (lat/lon, UTM, plane rectangular, geoid height)
- NMEA vs raw data (in more depth)
- Introduction to PPK / PPP post-processing
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