TerraStar Correction Services

Long-trusted as a strategic partner for high-precision positioning technology, NovAtel® offers a complete solution using TerraStar® Correction Services delivered directly to your GNSS receiver. Combining over 20 years of GNSS receiver expertise with the highest reliability clock and orbit data from a world-wide reference network means you have assured, reliable positioning anywhere, anytime.

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Here’s how we deliver sub-meter or centimeter-level positioning accuracy:

  1. Superior, independently owned and operated GNSS reference network provides the raw data to generate corrections.
  2. Corrections processing generates highly precise GNSS satellite orbit, clock biases and other systems parameters that can be delivered globally to any NovAtel receiver.
  3. Satellite-delivery of the corrections eliminates the need for base stations or cellular data plans.
  4. The high-rate, low-latency corrections provide NovAtel receivers with centimeter-level accuracy for any application.

TerraStar Correction Services offer a seamlessly integrated solution that delivers global coverage in any environment.

TerraStar Network Infrastructure:

Over 100 GNSS reference stations that are located around the world are operated, maintained and controlled by TerraStar. There are six Geostationary communication satellites, which means two beams are always visible from anywhere on earth. The TerraStar network has three network control centres and back to front line support is available 24 hours a day, seven days a week.


TerraStar premium GNSS corrections combined with NovAtel’s OEM technology offers sub-metre to centimetre-level positioning solution for land, unmanned and airborne applications globally. TerraStar corrections are available as a termed subscription directly from NovAtel.

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Service Levels

Performance TerraStar-L1 TerraStar-C2 TerraStar-C PRO
Horizontal Accuracy3 40 cm (RMS)
50 cm (95%)
4 cm (RMS)
5 cm (95%)             
2.5 cm (RMS)
3 cm (95%)             
Pass-to-Pass Accuracy  15 cm (95%)  3 cm (95%)  2 cm (95%) 
Vertical Accuracy3
60 cm (RMS) 6.5 cm (RMS) 5 cm (RMS)
Convergence Time4
< 5 min
30 min
< 18 min
Supported GNSS GPS/GLO
Supported Platform OEM7, SMART2, OEM6 OEM6 OEM7, SMART2
Horizontal Accuracy3
Pass-to-Pass Accuracy 
Vertical Accuracy3
Convergence Time4
Supported GNSS
Supported Platform



  • Satellite-delivered corrections eliminate the need for base station(s) and cellular network connectivity
  • TerraStar corrections superior GNSS reference network, redundant system architecture, continuous quality monitoring
  • High rate corrections provide rapid re-convergence, typically in less than 60 seconds following brief GNSS signal disruptions
  • OEM positioning technology allows continuous operation through correction signal interruptions up to 300 seconds 
  • Overlapping geostationary satellite coverage ensures maximal coverage  
  • Triple L-Band tracking5 allows better correction signals reception—even in challenging environments
  • A seamlessly integrated solution from a single source including GNSS hardware and corrections

    1. TerraStar-L is available on OEM7 products, SMART2 and the following OEM6 products: OEM628, FlexPak6 and SMART6-L products. 
    2. TerraStar-C is only available on OEM628, OEM638, FlexPak6, ProPak6 and SMART6-L products.
    3. Measured performance from seven-day static data. Horizontal and vertical accuracy may differ based on receiver capabilities, location, GNSS constellation health and visibility, GNSS/L-Band signal obstructions, level of multipath/interference, and local atmospheric conditions.
    4. Convergence times may vary by several minutes and are dependent on observing conditions including the number of visible GNSS signals, level of multipath and proximity to obstructions like large trees or buildings.
    5. Triple L-Band tracking is supported only on OEM7 platforms. Most locations have at least two geostationary satellites in view.