Construction project rework requests cost the industry an estimated $177 billion per year. Over 20% of rework requests are due to data inaccuracies, including survey errors. Survey errors occur on various jobs but become particularly costly on major construction projects. Accurate measurements are essential from the engineering stages onward. Today’s surveying firms need the right GNSS solution to deliver accuracy while staying within budget. This guide will show you how to balance both and find the right Trimble equipment for your needs.
Even small mistakes caused by global navigation satellite system (GNSS) issues can increase costs. This can happen due to rework or material waste. These mistakes can also create complicated legal issues for the construction even after the workers complete the job.
Trimble offers a wide range of GNSS products to help you feel more confident when surveying. They have decades of experience in the construction surveying market. If you need high accuracy in the pre-engineering stage or want to save on a tight budget, we can help. We’ll equip your firm with a clear framework for choosing the optimal Trimble GNSS solution.
Understanding Trimble GNSS Technology
You probably know about the Global Positioning System (GPS). The term GNSS includes GPS and all other satellite navigation systems used worldwide. Other systems include Russia’s GLONASS, Europe’s Galileo, China’s BeiDou, and regional systems like Japan’s QZSS and India’s IRNSS.
No matter the satellite system, GNSS receivers connect to it. They turn the signals into accurate position readings. This technology provides precise 3D positioning, enabling accurate surveying even in challenging conditions. Receivers translate signals from various global satellite systems into geographic coordinates, determining the exact location of each reference point. The signal travel time between the receiver and at least four satellites provides the exact data needed to verify positioning for all types of boundary, construction, and topographic surveys.
By using triangulation and related calculations, we can improve the accuracy of other surveying methods. This also helps fix small errors that can be added during a project. The GNSS receiver can complete this task on its own or in combination with a base station that requires correction.
Key Selection Factors
In a nutshell, the key selection steps include:
- Consider whether you need equipment for pure surveying, machine-control tasks, or cadastral work. GNSS and RTK features are essential for high-demand work.
- Decide whether to hit sub-meter, centimeter, or millimeter targets with Trimble equipment that meets your accuracy requirements, resulting in fewer rework requests.
- Ask yourself: Will your work environment cause connectivity issues due to urban canyons or heavy foliage? What about multipath risks from GNSS signals bouncing off nearby buildings, trees, or water surfaces?
- Avoid overspending on features you don’t need to stay within your budget while still getting the Trimble quality you need.
To go into more detail, these four factors must be considered before choosing a Trimble GNSS receiver that best aligns with your needs.
1. Application Requirements
These receivers are used across many branches of surveying. They’re essential for establishing accurate property lines in cadastral surveying and for settling legal disputes.
Trimble GNSS receivers must operate offline and be exceptionally durable for surveying tasks such as mining and landscape planning. Machine-control applications are incredibly demanding. They need highly accurate GNSS survey data to direct heavy equipment for land clearing, grading, and other construction tasks.
2. Accuracy Needs
Each type of surveying work requires a different level of accuracy. There is no need to spend more on a GNSS receiver that offers accuracy you don’t need.
Construction work often cannot proceed due to unresolved engineering design questions and land boundary disputes. You need accurate measurements in centimeters or even millimeters. Projects such as landscaping and roadworks may only require sub-meter accuracy, which can be achieved with an affordable receiver model.
3. Environmental Conditions
Congested work sites, especially those used for construction, make Trimble GNSS for construction challenging without the right receivers. Multipath risks from reflected signals bouncing off obstacles like tall buildings complicate surveying in urban environments.
This problem worsens due to urban canyons. These are areas where satellite connectivity is low, and tall buildings and other structures create canyon-like spaces.
In more rural areas, tree lines, wooded areas, and foliage also interfere with a strong GNSS signal. Civil engineering projects such as power plants, dams, and roads rely on Trimble equipment, which offers greater durability and resistance to damage. Connectivity options ensure good results, no matter what urban or rural environmental challenges your project faces.
4. Budget Constraints
There is no need to invest in the top-of-the-line GNSS equipment if you only need a simpler model. Finding the right balance is important. You need to consider advanced features and the total equipment cost. This will help you choose the best options for damage resistance, accuracy, and connectivity.
Business Benefits of Upgrading
Running smaller crews and enjoying higher margins on surveying projects can help you invest in more equipment, further streamlining future workflows. Lower labor costs don’t have to lead to quality issues, thanks to Trimble equipment that delivers sub-centimeter precision and reduces rework. It’s key to choose Trimble GNSS units that provide faster RTK convergence without sacrificing data capture rates. Your surveying or engineering business can access several potential benefits by upgrading to advanced GNSS receivers, including:
- Work quality: Sub-centimeter precision lowers the need to rework important property and engineering surveys, a significant cost factor for many construction projects.
- Speed: Faster real-time Kinematic (RTK) convergence and rapid data capture reduce unnecessary wait times in the field.
- Profit: Accurate, easy-to-use GNSS equipment can reduce labor costs. This happens because it boosts productivity with smaller teams, leading to higher profits.
Top Trimble GNSS Models for Construction Firms
There’s a Trimble GNSS for every kind of construction and engineering project, with prices and features that vary. Construction firms can choose from a number of top Trimble GNSS models.
1. Trimble R980 ($10,900.00)
The Trimble R980 is a top GNSS receiver. People recognize it for its high-quality and scalable channels. This makes it ideal for heavy-civil control networks.
- Choose the R980 for High-end Performance.
- Widely used for geofencing, stable survey control points, and other tasks required for heavy-civil and infrastructure projects.
- Provides advanced signal management to mitigate multipath issues and ensure unbroken connectivity in the field, including through scalable channels and expandable tracking options.
2. Trimble R12i
The Trimble R12i provides premium accuracy in challenging situations. It performs well in wooded areas, near treelines, tall buildings, and other congested sites.
- Select the R12i for its Premium Accuracy
- Ideal for construction and roadwork projects where complex site layouts make it hard to stay accurate over large areas
- Includes tilt-compensation for faster setup, Trimble ProPoint™ to deal with tree and building reflections, and xFill® for maintaining seamless corrections even when the stream drops temporarily
This model’s Trimble xFill corrections mitigate issues caused by poor connectivity and loss of access to RTK positioning services, helping reduce downtime in the field.
It provides continuous RTK and VRS coverage during correction outages. This is useful when there are black spots on the radio and cellular networks. Advanced tilt correction means it works in both urban and rural environments, where congestion prevents vertical access to the sky.
This model is great for roadwork. It meets the complex layout needs of civil and residential construction and is useful for cadastral surveying prior to construction.
3. Trimble R780 ($9,800.00)
If you need a tough GNSS receiver to handle the field, consider the Trimble R780. It delivers fast, high-quality RTK results, ideal for large infrastructure projects such as dams, earthworks, and roadworks. Built-in radios and quick setup steps make this surveying equipment great for teams with less experience.
- The R708 is a truly Rugged RTK unit
- Accurate convergence corrections for crucial large infrastructure and road works projects
- Built-in radios work in the most remote locations, while fast initialization gets RTK set up in just a few seconds, keeping your crew moving and reducing wasted time.
Pick the correct setup and features for your job. Discover how Trimble lets you add more functions as your needs change. Thanks to IMU-based tilt compensation, you can achieve high grades on QA/QC of executed work even on large site areas.
4. Trimble R2 ($3,500.00)
The Trimble R2 GNSS Receiver is an entry-tier model that is perfect for expanding construction site planning options without such a significant investment. It provides simplicity and mobile-app pairing for smaller crews in a compact package. Yet it’s still quite durable, with an IP65 rating.
- Get the Mid-range Versatility you need with the R2
- Built with small-to-mid surveying contractors in mind, especially for staking projects
- Compact for carrying across large sites, easy pairing with mobile apps to provide flexible control and data backup options.
You can process your data using Trimble’s office software, like TerraFlex or the Business Center. This helps you create deliverables with less effort.
The R2 provides many geospatial applications with positioning accuracy from submeter to centimeter. This makes it an excellent choice for surveying mines, construction sites, and roadwork, as well as for locating buried cables and pipes. It is also helpful for cadastral services.
5. Trimble R580 ($5,300.00)
Need ProPoint performance at an entry-level price*? The Trimble R580 is likely your best fit. It provides utility mapping and topographic survey features needed in urban and rural environments.
- The Value-Priced Solution from Trimble
- Topographic surveys and utility maps are done faster and easier without spending a bundle
- Provides ProPoint™ performance at an entry-level price
You can get precise corrections within 2 centimeters. Subscribe to the Trimble CenterPoint® RTX service for real-time updates. This service works through satellite or the internet.
You do not need a local base station or VRS network. The Trimble EVEREST Plus system improves multipath mitigation, resulting in cleaner signals.
Total Cost of Ownership (TCO) Considerations
Calculating your total cost of ownership (TCO) involves just a few distinct factors:
- Upfront Costs: The different levels of sub-meter accuracy and equipment durability greatly affect the total cost of ownership. Choose the right combination of receiver, accessories, and base station to avoid overspending.
- Ongoing Expenses: include RTK and RTX correction subscriptions, service plans, connected business software, and training support.
- Upgrading your Trimble GNSS receivers can help you earn a return on your investment (ROI). This can happen by reducing re-work requests for surveying. You will also benefit from faster site setups and lower labor costs. Additionally, you can increase your total billable hours.
- Potential Financing Options: Trimble and its resellers offer a range of financing options. If you need higher-grade equipment than you can afford right now, this may help.
In addition to the hardware and accessories you start with, you’ll have a few ongoing expenses. Correction subscriptions, including RTK or RTX services, make up the majority, but don’t forget service plans, software updates, and training programs. Keep in mind that many drivers deliver a healthy return on your investment, including reduced rework requests, faster site setup, and increased total billable hours.
Implementation & Best Practices
Even the best Trimble GNSS receivers can’t provide the ROI you expect unless you put them to their best use. Try these implementation tips to receive the best practices.
Control Network Setup: Base Stations vs. CORS Access
Setting up a base station near your GNSS receivers will provide more accurate results. This is better than using Continuously Operating Reference Stations (CORS). These reference points can help set up survey control points for construction projects at no cost. However, small mistakes can cause bigger problems later on.
CORS Access delivers RTK services over a network, providing convenience, rapid setup, lower initial equipment costs, and efficient results across large areas. However, they can’t compete with the superior accuracy of local base station use when it’s a matter of centimeter or millimeter measurements.
Daily QA Routines: Accuracy Checks, Calibration Logs
Establish daily QA routines for your receivers, including accuracy checks and full calibration logs. Check for any problems in these checks. This will help you avoid redoing the entire project due to a single receiver or connection issue. Keep your calibration logs for each project, as they record essential procedural data such as antenna height, receiver delays, and sensor performance. If there’s a dispute over your service quality in the future, you need to have evidence that you were performing the work as specified.
Operator Onboarding: Certification Paths and Refresher Training
Top-quality surveying equipment is only as useful as the operator’s skill. Invest in certification paths and refresher training directly from Trimble for the best results. Certification programs like Trimble Access Training and partner programs bring your team up to speed without any unnecessary delays.
Maintenance Schedules: Firmware Updates and Battery Health
Battery health requires proper charging and discharging habits to prevent damage. Your crew must also limit shocks, drops, and exposure to extreme temperatures. Don’t forget to keep up with any necessary firmware updates to access the latest features and connectivity support.
Frequently Asked Questions
RTK vs. RTX: Which correction service suits my connectivity?
Do you need corrections with an accuracy of under 2 cm? Then you’ll want to stick with RTK service whenever possible. RTX can only provide around 2 cm of accuracy, which won’t work for all complex engineering or construction applications.
RTK services are only available where you can connect to a base station. You often need to set up multiple receivers. For this level of correction service in areas with low connectivity and high congestion, consider RTX subscriptions. These subscriptions provide accuracy through satellite or internet connections.
Tilt Compensation: How much time does it save per stakeout?
When properly calibrated, the tilt compensation is almost instant. That can shave two to three minutes off each stakeout setup, adding up quickly on big projects. The time it takes can change based on the project and its challenges. However, tilt compensation can save hours on big projects with many contact points.
Leasing Options: Are financing plans available for small firms?
Trimble and its partners provide several financing options, some of which are aimed at small- and medium-sized surveying firms. Explore our financing plans here at Harper Surveying as well.
Model Upgrades: Can I trade in older units toward newer Trimble receivers?
Trimble partners routinely offer trade-in deals, allowing you to exchange your older equipment for credits towards new models. You may also be able to resell your older units to a private buyer to recoup funds for a new Trimble receiver. Contact your reseller to find out what’s available.
Power Management: What battery runtime can I expect on a full charge?
The runtime on these receivers can vary. It depends on the model, features in use, and outdoor temperatures. Depending on the Trimble model and the battery selected with the package, you can get anywhere from 4 to over 12 hours of runtime on a full charge.
Next Steps Recap
If you still need more data to help align your project needs with the right Trimble GNSS features, we can help. Download the full spec sheet for each model and use that information to run your TCO model for each Trimble receiver option. If you still need more information to make the right decision, contact us at Harper Surveying to request an on-site demo today. There’s a Trimble receiver that’s right for your team. Explore our Trimble selection today or contact our team for customized recommendations tailored to your firm’s needs.