When purchasing RTK (Real-Time Kinematic) technology, buyers rely heavily on spec sheets and brochures to make informed decisions. These documents are often packed with technical details, and manufacturers will often massage their numbers to make themselves look better. Manufacturers will present information in a way that makes their products appear more capable than they are, without providing the full context. Here, we break down five common tactics manufacturers use to mislead buyers and provide insights to help you avoid falling into these traps.
1. The Truth About Channel Counts
3. Battery Life in Real-World Conditions
5. The Hidden Costs of Paywalls
One of the first specifications highlighted in many RTK brochures is the channel count. This is an important number, that can tell you how capable a receiver is. A channel, in the context of an RTK receiver, is essentially a slot that processes signals from satellites. Each satellite signal requires a separate channel for reception and processing. At first glance, a higher channel count might seem like an advantage, implying the receiver can process more signals simultaneously. However, it is really not that simple.
Historically, channel count was a critical factor when technology had limitations in signal processing. Fewer channels meant fewer signals could be captured, which could lead to the receiver tracking an incorrect signal, or tracking a multi-path signal instead of the optimal signal for the current location and conditions. However, advancements in technology have rendered channel count less significant. Modern RTK receivers are capable of processing thousands of signals at once, with more than enough channels to process a signal from every satellite in orbit, not just the ones that are visible. This allows for advanced multi-path processing and better performance under trees and near buildings.
Where manufacturers will get you, is in the manner in which they count these channels. There are a ton of different ways to count channels and manufacturers do not disclose how they counted the number of signals they are reporting. This can create the illusion of a superior product, even when it is not the case. What this means is that it can be very hard to compare one receiver to another, it is like comparing apples to oranges. The true performance of an RTK receiver depends not on its channel count but on the quality of the signals it can process and the robustness of its GPS engine. For instance, support for advanced signals like Block III satellites and the ability to filter noise effectively are far more important considerations than the sheer number of channels. Check out our video series, where we tested out the Hemisphere S631 against the Trimble R12, Leica GS18, Topcon Hiper VR and more: Hemisphere S631 Testing Series.
Accuracy is a crucial selling point for RTK devices, but manufacturers will occasionally manipulate how it is reported. One common tactic involves the use of confidence intervals. Accuracy is typically expressed as a percentage confidence level—for example, a 95% confidence interval means the stated accuracy will be achieved 95% of the time. Some manufacturers, however, use a looser standard, such as a 67% confidence interval, to present tighter accuracy figures. While a 5 mm accuracy claim might sound impressive, it is far less meaningful if it is only achieved 67% of the time, compared to an 8 mm accuracy level achieved 95% of the time.
Another way accuracy claims can mislead buyers is through the testing conditions. Manufacturers often test accuracy in controlled environments where the base and rover are placed close together with no obstacles in between. In real-world applications, conditions are rarely this ideal. Factors such as trees, buildings, and longer distances between the base and rover can significantly impact performance. Additionally, when using a network solution like a cores or state network, accuracy may degrade further because you have no control over the constellations support by the network.
The best way to evaluate the accuracy of RTK equipment is to rely on real-world testing and user reviews. Seek out manufacturers or resellers who provide data from field tests conducted in environments similar to yours.
Battery life is another specification where manufacturers often create a misleading impression. The battery performance listed in brochures usually reflects lab tests conducted under optimal conditions. These tests typically involve single-rover setups in mild weather, which do not account for real-world variables.
In practice, battery performance is often much different than what is displayed on the spec sheet. When using a base station along with a rover, the base consumes significantly more power, reducing overall battery life. Most RTK units broadcast radio at a 1 Watt power level, which consumes battery faster than a network rover only receiving cell corrections. Environmental factors such as extreme heat or cold also have a substantial impact on battery longevity.
To mitigate these issues, consider investing in supplemental power solutions, such as external power poles, especially if you frequently work in challenging conditions. Additionally, user reviews can provide valuable insights into how battery performance holds up in real-world scenarios.
Radio range is another area where manufacturers often make exaggerated claims. Spec sheets typically advertise maximum ranges achievable only under perfect conditions—flat terrain, clear weather, and no interference. While these figures may be technically accurate in a lab setting, they rarely reflect what users experience in the field.
In real-world environments, obstacles such as dense foliage, buildings, and electromagnetic interference can significantly reduce radio range. Moreover, radios not specifically designed to handle challenging conditions may struggle to maintain reliable communication.
When evaluating RTK equipment, it’s important to look for products that are rated for performance in obstructed environments. User reviews and independent field tests are invaluable resources for assessing how well a device performs in realistic settings. For the Hemisphere S631, we tested two different conditions, an inner-city range test and open field test.
One of the most frustrating tactics employed by some manufacturers is the use of paywalls to restrict access to features. Buyers might assume that all advertised features are included in the purchase price, only to discover later that many functionalities require additional fees. These hidden costs can include access to certain satellite constellations, the ability to use a rover as a base, or advanced radio settings.
Paywalls not only increase the total cost of ownership but can also complicate workflows by restricting essential capabilities. Transparency is key when purchasing RTK equipment. Manufacturers who bundle all features into the initial purchase price offer a much better value and a more straightforward user experience.
To avoid falling for these misleading tactics, it’s essential to approach RTK purchases with a critical eye. First, research real-world performance by consulting independent reviews and field tests. Laboratory results, while useful as a baseline, rarely account for the complexities of actual use cases. Second, pay close attention to how specifications are presented. Ask manufacturers or resellers for clarification on confidence intervals, channel counts, and included features.
Companies like Benchmark, which emphasize transparency and real-world testing, set a standard for how RTK equipment should be marketed. By providing honest information and comprehensive support, they help buyers make informed decisions without unpleasant surprises.
In conclusion, RTK spec sheets can be a valuable resource, but they are often designed to highlight strengths while downplaying limitations. By understanding the common tactics manufacturers use to exaggerate their claims, you can navigate the buying process with confidence and find equipment that truly meets your needs.
Channel count refers to the number of “slots” in an RTK receiver that can process satellite signals. While manufacturers may advertise high channel counts as a sign of superior capability, modern receivers are already equipped to handle more than enough signals for reliable performance. Additionally, the way manufacturers calculate channel counts varies, making comparisons difficult. Instead of focusing on channel count, prioritize the receiver’s ability to process high-quality signals and filter noise effectively.
Manufacturers often report accuracy using different confidence intervals. For example, a 5mm accuracy claim might sound impressive but may only apply 67% of the time, whereas an 8mm claim achieved 95% of the time is more reliable in practice. Additionally, accuracy tests are often conducted in controlled environments, not accounting for real-world factors like trees, buildings, and greater base-to-rover distances. To evaluate true accuracy, look for real-world testing and independent reviews.
Battery life claims in spec sheets are typically based on lab tests under optimal conditions, such as single-rover setups in mild weather. In real-world scenarios, battery performance is affected by factors like the energy demands of the base station, environmental extremes, and higher power consumption in challenging conditions. To ensure sufficient power, consider external power solutions and consult user reviews for practical insights.
Radio range figures in spec sheets usually reflect ideal conditions—flat terrain, clear skies, and no interference. In real-world applications, obstacles like dense foliage, buildings, and electromagnetic interference can significantly reduce the effective range. Buyers should prioritize receivers designed for obstructed environments and evaluate performance through independent field tests or reviews.
Some manufacturers hide essential features—such as access to certain satellite constellations, base-to-rover flexibility, or advanced radio settings—behind additional fees. These paywalls increase the total cost of ownership and can limit workflows. To avoid surprises, choose manufacturers who include all advertised features in the base purchase price and be sure to ask about any additional fees upfront.
Bench Mark Equipment & Supplies is your team to trust with all your surveying equipment. We have been providing high-quality surveying equipment to land surveyors, engineers, construction, airborne and resource professionals since 2002. This helps establish ourselves as the go-to team in Calgary, Canada, and the USA. Plus, we provide a wide selection of equipment, including global navigation satellite systems, RTK GPS equipment, GNSS receivers, and more. We strive to provide the highest level of customer care and service for everyone. To speak to one of our team today, call us at +1 (888) 286-3204 or email us at [email protected]
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