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TerraStar-C Pro Multi-Constellation Correction Service

The NovAtel TerraStar-C PRO correction service cuts initial convergence times by nearly 60 percent and offers 40 percent better horizontal accuracy than the prior TerraStar-C service.  TerraStar-C PRO has with multi-constellation support, including the GPS, GLONASS, Galileo and BeiDou constellations.

SKU: TSC Categories: , Manufacturer: NovAtel

TerraStar-C PRO Multi-constellation Correction Service

NovAteL’S TerraStar-C PRO correction service with multi-constellation support, including GPS, GLONASS, Galileo and BeiDou

NovAtel introduced the TerraStar-C PRO service for its OEM7 and Smart7 family of products in 2019. TerraStar-C PRO replaced Terra-Star-C in 2019.

NovAtels TerraStar-C PRO offers a robust multi-constellation solution that provides greater positioning accuracy, availability and reliability than before. With the growing number of operational GNSS satellites, TerraStar-C PRO offers benefits in challenging signal conditions such as multipath, shading, interference and scintillation. High-rate TerraStar-C PRO corrections provide reconvergence in less than 60 seconds following brief GNSS signal interruptions.

TerraStar-C PRO corrections are generated using TerraStars proprietary global network of more than 100 strategically located GNSS reference stations. The correction data is delivered worldwide through overlapping geostationary satellites directly to a NovAtel receiver or via cellular IP network.

With OEM7 triple L-band support, TerraStar-C PRO correction signals from up to three satellites can be tracked and used simultaneously, providing continuous correction data reception when the primary satellite signal is blocked.

Correction Service Options

Performance TerraStar-X 3 TerraStar-L 1 TerraStar-C 2 TerraStar-C Pro
Horizontal Accuracy 3

2 cm (RMS)

2.5 cm (95%)

40 cm (RMS)

50 cm (95%)

4 cm (RMS)

5 cm (95%)

2.5 cm (RMS)

3 cm (95%)

Vertical Accuracy 3 5 cm (RMS) 60 cm (RMS) 6.5 cm (RMS) 5 cm (RMS)
Convergence Time 4 <1 min <5 min 30-45 min <18 min
Supported Platform OEM7 OEM7, OEM6 OEM6


Coverage Area Regional Global Global



  • 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 and the following OEM6 products: OEM628, FlexPak6 and SMART6-L products. TerraStar-L convergence time is specified to a horizontal accuracy of 50 cm at 95 percent.
  2. TerraStar-C was replaced by TerraStar-C Pro in 2019. 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. TerraStar-C and PRO convergence times are specified to a horizontal accuracy of 5 cm at 95 percent. TerraStar-L convergence time is specified to a horizontal accuracy of 50 cm at 95 percent.
  5. Triple L-Band tracking is supported only on OEM7 platforms. Most locations have at least two geostationary satellites in view.

NovAtel TerraStar Brochure

Hexagon NovAtel Correction Services Brochure

Introducing TerraStar-C PRO (ION-2018)

TerraStar Correction Services Quick Start Guide

Using TerraStar Corrections Application Notes


TerraStar FAQs

1. On which NovAtel products are TerraStar and RTK ASSIST services available?

TerraStar services are available on most OEM6® and OEM7® products with minor exceptions shown in the table below. Customers using OEMV™ or SPAN® on OEMV products will need to upgrade to OEM6 or OEM7 hardware to get TerraStar services.

TerraStar Service OEM6 OEM7 Products Supported
TerraStar-L OEM628, FlexPak6, SMART2 and SMART6-L. All OEM7.
TerraStar-C OEM628, OEM638, FlexPak6, ProPak6 and SMART6-L products. 
TerraStar-C PRO All OEM7. SMART2.
RTK ASSIST OEM628, FlexPak6 and SMART6-L. All OEM7.

2. What applications can benefit from TerraStar or RTK ASSIST services?

TerraStar GNSS corrections and NovAtel OEM solutions are used in agriculture, survey, GIS, mobile mapping, construction and mining, unmanned and airborne applications. Contact NovAtel Sales to discuss your specific needs.

3. How can I purchase a TerraStar or RTK ASSIST service?

NovAtel customers can purchase a TerraStar or RTK ASSIST services directly from NovAtel. If you purchased your NovAtel product from an authorized dealer or integrator, please contact them directly to purchase subscriptions. Click here for a list of NovAtel dealers.

4. How are TerraStar and RTK ASSIST services activated on a receiver?

TerraStar and RTK ASSIST services are activated for a specific unit via a subscription. The customer can request the service to start immediately or at a specified start date/time.

Activation messages for the subscription are sent over the air via satellite at the start of the service and for a period of 30 days after the activation start date. Customers can request a resend of their activations through NovAtel support if the initial activation was missed. 

5. What is the difference between regional and global subscriptions?

Regional subscriptions are transmitted over three adjoining satellites to provide continent-wide coverage. Global subscriptions are transmitted over all seven satellites to provide worldwide coverage.

6. Are there any restrictions in using TerraStar services?

All land subscriptions are limited to a maximum speed of 130 km/hr (or 80 mph) and operate on land only. Unmanned subscriptions have no speed limit and operate up to 10 km from shore to allow operation along coastlines. Airborne subscriptions are not restricted geographically and have no speed limitation.

TerraStar subscriptions cannot be used for marine and offshore applications. Contact NovAtel support to discuss more about your application needs. 

7. Is there a demo/test activation for TerraStar services?

Yes, customers can request demo/test activations. Contact your local dealer or NovAtel support for more information. 

8. Where can I get further support related to TerraStar subscription services?

NovAtel’s Application Engineering team supports all products sold by NovAtel, including TerraStar and RTK ASSIST subscriptions.

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