Trimble RTX® correction services are GNSS correction services for agricultural guidance systems that provide users with worldwide, real-time, high-accuracy positioning by satellite or Internet, without the need for a base station or a VRS network. Farmers can quickly and easily work anywhere on their farm with repeatable pass to pass, and year to year accuracy.

Correction Service	Delivery Method1	Horizontal Accuracy (cm) or (in)1	Initialization Time (mins)
CenterPoint® RTX	Satellite and Internet	2.5 cm (1")	< 2 min in Fast coverage regions, < 5 min for Trimble ProPoint devices2 < 20 min in Standard coverage regions
RangePoint RTX®	Satellite	15 cm (6”) pass to pass, 50 cm (20”) repeatable	< 5 min
ViewPoint RTX™	Satellite	30 cm (12”) pass to pass	< 5 min
CenterPoint® VRS	Internet (in select regions only)	2.5 cm (1")	Instant
xFill® Premium	Satellite	2.5 cm (1")	Instant switch over after RTK signal loss

¹95% performance based on repeatable in field measurements. Achievable accuracy and initialization time may vary based on type and capability of receiver and antenna, user’s geographic location and atmospheric activity, scintillation levels, GNSS constellation health and availability and level of multipath including obstructions such as large trees and buildings.

²Global average initialization time when using GPS, GLONASS, Galileo, and BeiDou available globally by IP and regionally by L-band.

Trimble RTX corrections are used for high-accuracy GNSS positioning in place of, or to complement traditional RTK base stations or VRS Now networks. Farmers use Trimble RTX corrections in many applications such as strip tiling, planting, seeding, spraying, spreading, broad-acre applications, and more.

RTX stands for Real Time eXtended (RTX). It is the technology that powers Trimble RTX correction services.

Trimble RTX technology works by using real-time satellite measurements delivered to a global network of tracking base stations. These measurements, along with highly accurate atmospheric models and algorithms, generate Trimble RTX corrections at worldwide control centers that are broadcast to the receiver by satellite or over the Internet. The GNSS receiver uses these corrections to improve the accuracy of its positions.

Trimble CenterPoint® RTX Fast is a regionally available correction service that delivers a convergence time of less than 2 minutes for 2.5cm (1”) horizontal accuracy.

View Coverage Maps

xFill is a backup solution for RTK and VRS corrections during times of signal interruptions due to cellular signal loss or loss of radio connectivity and outages due to scintillation interference. If you were to lose your RTK or VRS correction services signal for any reason, xFill can be used to bridge these interruptions with high accuracy for 20 minutes. xFill works seamlessly in the background, calculating Trimble RTX positions constantly and will automatically bridge positioning gaps delivered by satellite (not available for an Internet delivery method), allowing continued field operations during RTK/VRS signal interruptions and during most periods of scintillation interference that renders RTK inoperable.

xFill Premium is similar to Trimble’s standard xFill service, but delivers CenterPoint RTX positioning accuracy for the entire duration of the interruption, extending xFill’s service which is limited to just 20 minutes. xFill Premium works seamlessly in the background, calculating Trimble RTX positions constantly and will automatically bridge positioning gaps delivered by satellite (not available for an Internet delivery method), allowing continued field operations during RTK/VRS signal interruptions and during most periods of scintillation interference that renders RTK inoperable.

The performance specifications for Trimble RTX correction services are listed below, dependent on receiver type and region of operation.

Correction Service	Delivery Method	Horizontal Accuracy (cm) or (in)1	Initialization Time (mins)
CenterPoint® RTX	Satellite and Internet	2.5 cm (1")	< 2 min in Fast coverage regions < 5 min for Trimble ProPoint™ devices2 < 20 min in Standard coverage regions
RangePoint®RTX	Satellite	15 cm (6”) pass to pass, 50 cm (20”) repeatable	< 5 min
ViewPoint RTX™	Satellite	30 cm (12”) pass to pass	< 5 min
CenterPoint®VRS	Internet	2.5 cm (1")	< 5 min
xFill® Premium	Satellite	2.5 cm (1")	Instant switch over after RTK signal loss

¹95% performance based on repeatable in field measurements. Achievable accuracy and initialization time may vary based on type and capability of receiver and antenna, user’s geographic location and atmospheric activity, scintillation levels, GNSS constellation health and availability and level of multipath including obstructions such as large trees and buildings.

²Global average initialization time when using GPS, GLONASS, Galileo, and BeiDou available globally by IP and regionally by L-band.

Initialization (also known as convergence) is the start-up process of calculating the receiver’s position to a desired accuracy level. When the position of the receiver reaches full accuracy, then it is considered fully initialized, and you can start working with confidence. Once initialized, the receiver will maintain that level of accuracy unless initialization is lost through GNSS signal interruptions. If the receiver does experience a disruption in GNSS corrections, re-initialization is required.

Initialization time ranges from 1-20 minutes based on type of correction service, type of receiver and antenna, geographic location, atmospheric activity, scintillation levels, and other variables.

Correction Service	Initialization Time (mins)
CenterPoint® RTX	< 2 min in Fast coverage regions < 5 min for Trimble ProPoint™ devices1 < 20 min in Standard coverage regions
RangePoint®RTX	< 5 min
ViewPoint RTX™	< 5 min
CenterPoint®VRS	< 5 min

¹Global average initialization time when using GPS, GLONASS, Galileo, and BeiDou available globally by IP and regionally by L-band.

Yes, but it is recommended that you wait for your receiver to be fully initialized in order to work with the correction service’s full accuracy. Most Trimble RTX capable receivers will allow you to set a “convergence threshold”, which allows you to determine what accuracy level must be reached before you begin working.

No, the receiver does not need to remain stationary while initializing, and the initialization time will be similar whether the receiver is moving or stationary. However, it is recommended that you remain stationary because any overhead obstructions that may occur while you are moving will extend the initialization time.

If your receiver loses all GNSS signals at once, positioning will stop immediately. In case the GNSS visibility resumes after less than 5 minutes, a special method is used to rapidly produce quality positions again by accounting for changes to the ionosphere. Otherwise, a regular convergence time may occur.

If you temporarily lose the Trimble RTX correction signal, the receiver can continue working around 200 seconds before a full re-convergence is necessary. Full accuracy will resume quickly in case the RTX correction stream is back within 200 seconds. Otherwise, a regular convergence time may occur.

CenterPoint RTX has multiple initialization times for various reasons:

• Satellite baud rates, which affect initialization times, are different in various regions.


• The type of receiver you use impacts the initialization time you can achieve.


• There are regions where CenterPoint RTX Fast is available; these regions receive a convergence time of <2 minutes.


• If you are using a Trimble NAV-900 receiver with ProPoint technology, you will experience initialization times <5 minutes in a majority of regions worldwide.


• The standard performance for initialization time for any other positioning receiver in most regions is about <20 minutes.

Please view the coverage map to see what is available on your farm.

CenterPoint RTX Fast Restart is a feature that allows rapid re-initialization of CenterPoint RTX based on a previously known point. By starting the receiver in the same location that it was in when it was last turned off, CenterPoint RTX can fully initialize in less than 5 minutes. When using CenterPoint RTX Fast, this feature is not applicable, as the solution can fully initialize in less than 2 minutes.

CenterPoint RTX and RTK both offer GNSS corrections however they differ in several ways:

Trimble RTX correction services are different from SBAS systems like WAAS and EGNOS because Trimble RTX technology is compatible with multiple GNSS constellations whereas SBAS systems typically use only one GNSS constellation to generate corrections. Trimble RTX technology provides more accurate, consistent, and repeatable positioning than WAAS or EGNOS. Trimble RTX correction services are also available worldwide while SBAS systems are limited to certain regions.

There are external environmental factors that can cause errors or temporary outages of the Trimble RTX correction services that might degrade accuracy and convergence. These factors can also affect other GNSS correction sources and include:

• Solar activity: GNSS signals can be impacted by solar activity as they pass through the Earth’s atmosphere and result in a phenomenon known as scintillation.


• Obstructions: Any objects that prevent a receiver from receiving information from GNSS satellites or the Trimble RTX correction stream can impact accuracy or cause outages. Tall trees and steep terrain are common obstructions that impact farmers. Trimble RTX delivered by IP can help mitigate outages when the Trimble RTX satellite is blocked by obstructions, but won’t help when GNSS satellites are blocked or when GNSS signals are degraded by obstructions.


• Interference: Other signals which are adjacent and similar to the GNSS navigation signals frequency will disrupt the reception of the true signal in the GNSS receiver

No, Trimble RTX correction services will not work indoors. GNSS positioning requires a clear line of sight between the GNSS receiver and GNSS satellites.

Trimble RTX correction services have exceptional up-time because it uses a worldwide network of base stations, with redundancies in the entire infrastructure system, to calculate and deliver the correction services. All base stations, correction solutions, and delivery mechanisms are monitored and supported 24 hours a day, 7 days a week, 365 days a year by Trimble’s global team of network engineers and IT specialists to ensure reliability in worldwide positioning and broadcasting.

Trimble RTX correction services are available worldwide through satellite and internet delivery. The satellite coverage area is shown on the map below. Trimble RTX Fast is available in most of North America and Europe. Delivery by IP/cellular is available anywhere that an internet connection is available.

View Coverage Maps

Trimble RTX correction services support GPS, GLONASS, Galileo, BeiDou, and QZSS GNSS constellations.

The International Terrestrial Reference Frame (ITRF) is a terrestrial reference frame established and maintained by the International Earth Rotation and Reference Systems Service (IERS). ITRF is the realization of an ideal reference frame, the International Celestial Reference System (ICRS), which is also maintained by IERS; this realization is based on estimates of position and velocity of terrestrial stations observed by VLBI, LLR, GPS, SLR, and DORIS. Due to the motion of the Earth’s crust, the terrestrial positions of points on Earth are constantly changing. A position at a specific instance in time will have both a reference frame (e.g. ITRF2014) and an epoch (e.g. epoch 2005.00); the epoch is the time the realization refers to.

Both ITRF and WGS84 are global datums; WGS84 is used by GPS, and is based on a specific realization being updated periodically. Since 1997, WGS84 has been maintained to within 10 cm of the then current ITRF realization. While Trimble RTX positions are computed in ITRF2014 current epoch, autonomous GPS positions are provided in the current realization of WGS84. This discrepancy in time will usually result in a small difference between the coordinates of a position in ITRF and the coordinates of the same position in WGS84.

Trimble RTX coordinates are computed in ITRF2014 current epoch; these coordinates will be transformed to a fixed epoch dependent on the receiver and field software. For example, Trimble Access will transform the coordinates of an R10 using RTX to ITRF2014 Epoch 2005.0. Trimble Access 2020.20 or later will store the initially calculated RTX positions as ITRF2014 current epoch, and also transform them to your local reference frame - in many cases, with mm-level transformation accuracy! xFill Premium applies an offset to the Trimble RTX positions resulting in positions that match the RTK/VRS coordinate reference frame that is being used.

NOTE: You can use the Trimble CenterPoint RTX Post Processing service to determine an ITRF2014 epoch 2005.00 position for your base station and control points. Trimble CenterPoint RTX Post Processing service is available at www.TrimbleRTX.com

Trimble RTX subscriptions are available for different levels of accuracy to suit your needs. For information on specific subscriptions available in your region, please contact your local Trimble Dealer, Trimble Customer Care or visit our online store.

Trimble RTX correction services are activated with a subscription. After purchasing your RTX subscription, it can be activated either over-the-air (OTA) or through a manual passcode entry on your GNSS receiver. Some receivers also support activation through scanning a QR code or uploading a license file. If you need assistance with activation, please contact Trimble Customer Care or your local Trimble Dealer and provide them with your account information and/or the serial number of your receiver.

• Over-the-air activation: This is an activation that is sent via satellite and/or Internet directly to the receiver. Once this activation is received, the service will be ready to use. This is currently supported on the AG-372, AG-382, and AG-482.


• Manual activation: An activation passcode is emailed to you when you purchase a Trimble RTX subscription. You then key this passcode into your receiver to activate your subscription, which can be used right away.


• QR code: The activation email will include a QR code that can be scanned using the camera on your display. This is currently supported on the TMX-2050, and NAV-900 (using GFX-750/XCN-1050/GFX-350/XCN-750).


• License file: The activation email will include a license file that can be uploaded onto the display, which is then read by the software to activate the subscription.

If you missed the over-the-air activation, you can resend the OTA activation yourself at resend.trimble.com. You can also contact your local Trimble Dealer or Trimble Customer Care to request the activation broadcast be re-sent. Please have your account information and/or the serial number of your receiver with you when contacting Trimble Customer Care. If you received a passcode, you may also manually enter the passcode into your GNSS receiver.

Trimble will automatically renew your subscription if you are enrolled in Automatic Renewal. For more information on your enrollment, contact Trimble Customer Care. If you are not enrolled in Automatic Renewal, you will need to renew your subscription by logging into your account or by contacting Customer Care. More information about auto-renewal can be found in our Terms & Conditions.

You will receive a renewal notice 45 days before your subscription is due to expire advising you of your expiration date and the renewal process. All subscription information is also available by logging into your account.

Most Trimble receivers will show the expiration date on the display. If you are unsure on how to find this, you can contact Trimble Customer Care and a member of our team will be able to assist you.

Yes, there is a free 3-day demo subscription available for all compatible receivers. This can be activated here or by contacting Trimble Customer Care.

You can purchase Trimble RTX correction services through the online store, through a local Trimble dealer or by contacting Trimble Customer Care by phone or email. Subscriptions can be managed directly through the online store.

Pricing is available on the Positioning Services online store. Please contact your local Trimble dealer or Trimble Customer Care for any further details.

Customer support is available 24 hours a day, 7 days a week, 365 days a year by contacting Trimble Customer Care by phone and email. With regional offices worldwide, we can help you with any questions or concerns you have.