GNSS Correction Sources

The high level of accuracy you need on a construction site cannot be done with GPS alone. GPS accuracy and integrity can be enhanced using RTK correction services. There are many forms of RTK correction sources and all provide you the information needed to improve GPS/GNSS performance and accuracy.

Your GNSS operation is only as good as your correction source, making it important to choose the right one. Trimble’s GNSS correction services allow you to do just this. Large sites may need a GNSS base station while small sites can opt for a virtual correction source.


GPS/GNSS correction sources available through SITECH West include:

  • Trimble GNSS Base Station – This is a modular receiver that serves as the base station for your construction site. The Trimble® SPS855 GNSS Modular receiver pairs with your Trimble external antenna to make a permanent base station for your large construction site or your site that uses site positioning as well as machine control.
  • Trimble Internet Base Station Service (IBSS) – If you need a more flexible GNSS correction sources solution, consider the Trimble Internet Base Station Service. This is an economical alternative to the full base station that still provides accurate GNSS positioning and Real-Time Kinematic (RTK) corrections through the internet.
  • Omnistar – Subscribe to Omnistar through SITECH West for reliable RTK positioning 24/7/365, with accuracy within 10 centimeters.
  • Trimble VRS Now Subscription Service – In the past, if you haven’t been willing or able to set up a GNSS satellite systems base station, you had a problem. Make sure you never have that problem again by subscribing to our Trimble VRS Now Subscription Service, which provides RTK positioning with centimeter-level accuracy on demand through our CORS (Continuously Operating Reference Stations) network.

At SITECH West, we’re committed to providing you with the best high-tech construction solutions for your operation. For information on Trimble GNSS systems and GNSS correction sources from SITECH West for your construction jobs, click the link above corresponding to the GNSS systems solution you are interested in or contact us now for more information.


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