RTK‑GNSS Receivers vs Smartphone RTK: Accuracy + Field Tests | LRTK

Table of Contents

• Basic principles and types of RTK-GNSS

• Comparison between typical RTK-GNSS receivers and LRTK smartphone surveying

• Technologies that enable LRTK to achieve centimeter-level accuracy

• Comparative verification under various environments and positioning conditions

• Differences in peripheral functions and UX such as point-cloud measurement, photos, and AR guidance

• LRTK cloud integration and operational advantages

• Simple centimeter-accuracy surveying starting with LRTK

• FAQ

Basic principles and types of RTK-GNSS

For high-precision surveying, technologies that correct satellite positioning errors to obtain centimeter-level position accuracy are essential. In general standalone positioning, various errors such as satellite orbit and clock errors, ionospheric and tropospheric signal delays, and multipath (reflections) caused by buildings or terrain are not corrected and accumulate, so the actual measurement accuracy remains about 3–10 m (9.8–32.8 ft). Ordinary smartphone GPS or car navigation systems often deviate by several meters and are far from the few-centimeter accuracy required for construction management or surveying tasks.

RTK (Real Time Kinematic) positioning was developed to solve this problem. In RTK, both a base station (fixed station) and a rover (mobile station) simultaneously receive GNSS satellite signals, and by calculating the difference of that data in real time, common error components are canceled out. This achieves high accuracy not attainable by standalone positioning; depending on conditions, RTK positioning can achieve errors of a few centimeters both horizontally and vertically. In practical fields, for example, horizontal errors of about 2–3 cm (0.8–1.2 in) and vertical errors of about 3–5 cm (1.2–2.0 in) can be used to pinpoint positions, providing a dramatically improved accuracy compared to standalone positioning.

There are two major RTK operation types. One is the base-station method (single-reference-point RTK), where you install your own reference receiver near the site and transmit the error from its known coordinates to the rover via radio or wireless. The other is the network RTK method, which uses correction information combined from multiple fixed stations such as the Geospatial Information Authority of Japan’s network of Continuously Operating Reference Stations via communication lines (generally distributed via a protocol called Ntrip, with VRS^※ being a representative method). With network RTK, you don’t need to set up a dedicated base station; the rover’s GNSS receiver can receive correction data via cellular communication and perform positioning. Because nationwide reference station networks are established in Japan, surveying using network RTK is becoming mainstream.

Besides RTK, another high-precision positioning technique is PPP (Precise Point Positioning). PPP improves standalone positioning accuracy using global satellite orbit and clock error models and augmentation information broadcast from satellites, and it has the advantage of not requiring a base station. However, real-time PPP requires time for initial convergence and can take several minutes to tens of minutes to reach centimeter-level accuracy. Therefore, for surveying that involves movement or applications requiring immediate high accuracy, RTK—which provides instant error correction—has the advantage (PPP is effective when it is difficult to install reference stations over a wide area, so choosing the appropriate method is important). The CLAS service provided by Japan’s Quasi-Zenith Satellite System “Michibiki” (described later) is a PPP-RTK satellite augmentation service and is attracting attention as a correction means that can be used even outside communication coverage.

Comparison between typical RTK-GNSS receivers and LRTK smartphone surveying

What are the differences between conventional fixed RTK-GNSS equipment and the new LRTK smartphone surveying solutions? Here we compare them in terms of accuracy, initialization speed, antenna performance, operability, and cost.

Positioning accuracy: Both dedicated survey RTK-GNSS receivers and LRTK devices can fundamentally perform centimeter-level high-precision positioning in real time. High-quality GNSS receivers can achieve errors within a few centimeters by obtaining an RTK FIX solution (fixed integer solution), and LRTK likewise realizes position accuracy of about 2–3 cm (0.8–1.2 in) horizontally by using correction information. Field verifications show that RTK positioning with LRTK provides stable accuracy sufficient for ordinary surveying tasks (errors of a few centimeters), producing results comparable to conventional equipment. As long as satellite signals are not severely blocked, measurement point coordinates can be recorded within an error range of a few centimeters, making both suitable for applications that require high precision.

Initialization time: The initialization time (TTFF: Time To First Fix) until a FIX solution (integer solution) is obtained after starting RTK positioning is generally short for both traditional receivers and LRTK. For network RTK, initialization usually completes in a few seconds to a few tens of seconds, making centimeter-level position information available. There is little difference between LRTK and dedicated devices in this regard: both apply correction information using the same principle, so in open environments high-precision positioning begins almost immediately. However, when using satellite augmentation services (PPP-RTK) outside communication coverage, several minutes may be required for initial convergence. LRTK supports satellite augmentation signals (CLAS), but in that case accuracy is somewhat lower immediately after measurement start and stabilizes after a few minutes of static observation. Conversely, when using network RTK, a FIX solution can be obtained instantly as with conventional devices, so for tasks performed while moving, using network RTK in areas with adequate communication coverage is efficient.

Antenna performance and positioning stability: Typical surveying GNSS receivers are equipped with large, high-sensitivity antennas and ground planes to reduce multipath errors and receive weak satellite signals. LRTK, on the other hand, incorporates a small smartphone-mounted antenna, but with modern multi-GNSS support it can use many satellites simultaneously, enabling stable positioning in practice. Because the antenna diameter is smaller than conventional equipment, there is potential for slightly more influence in urban canyons or under trees. However, LRTK secures satellite numbers and minimizes accuracy degradation by receiving signals not only from GPS but also GLONASS, Galileo, and Michibiki (QZSS). As a result, it can maintain a certain level of stability even in environments with poor line-of-sight, and in many cases the FIX solution can be maintained under some occlusion. (In extreme conditions, maintaining a fixed solution is difficult for any device, but if environmental conditions are the same, LRTK and conventional devices have comparable stability.) Operational countermeasures such as adjusting antenna installation or temporarily moving to an open area for reinitialization are effective for both.

Operability and usability: Conventional RTK-GNSS systems required transporting and setting up multiple pieces of equipment—an antenna-integrated positioning terminal, a data collector (field controller), a communication modem, and sometimes a tripod or pole. Skilled surveyors would carry heavy equipment to the site, set up and configure base stations, and connect between devices, involving cumbersome steps. LRTK, however, completes the task with just a smartphone and a small receiver, and operation is extremely simple—just operate the smartphone screen. Dedicated apps are designed with intuitive UIs, and coordinate measurement and recording execute by following on-screen prompts and tapping buttons. There is no need for multiple people to carry a full set of equipment; a pocket-sized LRTK can be quickly taken out on site and measurements started immediately. Tasks that traditionally required two people, such as setting out formwork, can be done by one person with LRTK, substantially improving site efficiency. The fact that complex settings and specialized knowledge are nearly unnecessary is also an operational advantage, making LRTK easy to adopt even for those new to RTK.

Acquisition cost: Survey GNSS equipment tends to be expensive because it uses dedicated components such as high-performance antennas, receiver circuits, and rugged housings. A complete set of conventional RTK equipment (rover + controller, and possibly base station equipment) can cost several million yen depending on the manufacturer. This high price made it difficult for small businesses or local governments to acquire multiple sets. LRTK, by leveraging users’ smartphones, can drastically reduce costs. The dedicated devices themselves are miniaturized and have lower manufacturing costs, allowing pricing that is a fraction of conventional equipment. The low initial cost and the ease of supplying one unit per person mean that centimeter-precision positioning can be made available whenever needed. Lowering the cost barrier will likely accelerate the spread of high-precision positioning across many sites.

Technologies that enable LRTK to achieve centimeter-level accuracy

LRTK smartphone surveying achieves high accuracy despite its small size by combining the following advanced technologies.

• CLAS support (use of satellite augmentation services): LRTK supports Japan’s Quasi-Zenith Satellite System “Michibiki” Centimeter Level Augmentation Service (CLAS). CLAS distributes PPP-RTK correction data such as orbit and clock error corrections and observations from reference stations via an L6-band signal from satellites. By attaching a dedicated antenna to an LRTK device, this CLAS signal can be received directly and real-time corrections applied. In other words, centimeter-level positioning is possible using only satellite-based correction information even in mountainous areas or remote islands without cellular coverage (positioning accuracy gradually improves after a few minutes of reception at startup). The ability to fully utilize free satellite augmentation is a major strength of LRTK.

• Support for network RTK corrections: In areas with cellular coverage, LRTK performs centimeter-level positioning using conventional network RTK. The smartphone connects via the Internet to Ntrip-compatible reference station network services and receives high-precision correction data in real time. It supports public continuous GNSS observation networks and private high-precision GNSS correction services, so users do not need to provide their own base station. In stable communication environments, a fixed solution is obtained within seconds, enabling smooth response to dynamic surveying tasks. All LRTK models support major domestic correction services (for example, high-precision positioning services provided by major carriers), making it easy to integrate into existing operations.

• Multi-GNSS and triple-frequency support: LRTK receivers support multiple satellite positioning systems and multiple frequency bands. Specifically, they can simultaneously receive GPS, GLONASS, Galileo, and Michibiki (QZSS) signals, and fully utilize triple-frequency signals including L1/L2 plus L5 or L6 bands. This dramatically increases the number of visible satellites, making it easier to secure enough satellites even in the shadows of buildings or under trees. Using three frequencies also improves ionospheric delay correction accuracy, accelerating integer ambiguity resolution for RTK. While dual-frequency (L1+L2) was common in the past, LRTK’s triple-frequency capability speeds initialization and improves positioning stability. This advanced multi-GNSS and multi-frequency specification is the secret to delivering conventional-equivalent performance in a compact device.

• RTK computation in the smartphone app: LRTK offloads much of the positioning computation to a dedicated smartphone app. Raw data acquired by the GNSS receiver is sent to the phone via Bluetooth or Lightning, and RTK solution processing (differencing and filtering) is performed inside the app. Leveraging the high-performance CPU and memory of modern smartphones reduces processing load and power consumption on the small device while enabling advanced algorithms. This allows hardware to be downsized and cost-reduced while continuing to improve computation through software updates. Because the smartphone can be Internet-connected, correction data retrieval and cloud integration are seamless. In short, LRTK is designed with the idea of “running the GNSS engine on the smartphone,” which is the driving force behind pocket-sized centimeter-level positioning.

Comparative verification under various environments and positioning conditions

RTK positioning performance is influenced by environmental conditions; here we explain expected results when comparing LRTK and conventional equipment in real environments. We look at accuracy trends by environment—open areas, urban canyons, mountainous/forested areas—and differences between static and kinematic measurements.

Open environments: In open sites without tall buildings or obstructions, both conventional devices and LRTK can receive satellite signals well and maintain a stable fixed solution. With sufficient satellite numbers and good geometry, horizontal and vertical errors stay within a few centimeters, achieving ideal positioning accuracy. For example, tests in suburban open fields comparing known points showed LRTK RTK positioning average errors of about 2–3 cm (0.8–1.2 in) horizontally and about 3–5 cm (1.2–2.0 in) vertically, with maximum deviations remaining only a few centimeters. This is equivalent to the accuracy level of conventional survey RTK equipment; in open environments even small LRTK units deliver comparable performance. Initialization completes in seconds, and no large error fluctuations occur during positioning, enabling reliable real-time positioning.

Urban areas (building canyons): In urban canyons surrounded by tall buildings, some satellite signals are blocked or reflected, creating a multipath environment. Even conventional RTK receivers with high-performance antennas can see degraded accuracy and unstable solutions in urban areas. LRTK likewise can experience temporarily larger errors in city centers due to reduced satellite visibility and reflections. Experiments showed that while the average error in urban LRTK positioning remained at a few centimeters, occasional deviations of more than 10 cm (about 4.0 in) were observed. This can also occur with conventional equipment and indicates that RTK accuracy can deteriorate to several tens of centimeters under adverse environmental factors. If you are completely in a building shadow and cannot maintain sufficient satellite reception, a fixed solution may be lost and fall to a FLOAT or NG solution. In such cases, LRTK users can monitor status on the smartphone screen and move to a slightly more open area to regain FIX. In urban settings, it is important—just as with conventional equipment—to ensure sky visibility and avoid blocking above the antenna. LRTK’s small antenna can be an advantage in maneuverability, making it easier to find the best reception positions between buildings.

Mountainous and forested areas: In valleys and near forests, mountain shapes and trees block parts of the sky. Even in such environments, LRTK can secure a surprisingly large number of satellites thanks to multi-GNSS support. In forest-adjacent RTK tests, horizontal error averaged about 3–4 cm (1.2–1.6 in) and vertical error about 6–7 cm (2.4–2.8 in), maintaining practically acceptable accuracy. However, directly beneath dense tree cover where the sky is barely visible, maintaining a fixed solution can be difficult and the solution may drop to FLOAT. In such cases it is better to pause measurement and move to an open area to reinitialize (a static wait of a few tens of seconds). Conventional receivers also struggle in mountainous areas, but LRTK’s strength is that it can use satellite augmentation CLAS even outside cellular coverage. If you equip the LRTK device with a coverage-friendly antenna, you can receive corrections directly from Michibiki and expect more stable accuracy than long-baseline single-base RTK—though dense foliage can also block augmentation signals, so limits remain. Overall, errors in forest environments may increase to a few centimeters to several tens of centimeters, but LRTK can perform comparably to conventional equipment.

Static vs. kinematic measurements: RTK positioning shows slight differences in accuracy when the device is static versus moving. When static, continuous observation of the same point stabilizes the data and provides a more robust solution. The LRTK app includes a static-point averaging function: for example, outputting the averaged coordinates from continuous observation over several seconds can reduce per-point scatter to a few millimeters. In an experiment, averaging 60 measurements at a single point produced extremely stable values of less than 1 cm (0.4 in) horizontally and vertically. This equals or exceeds the accuracy achievable with conventional static surveying and is suitable for reference-point surveys. Conversely, dynamic positioning—such as walking surveys or mounting on moving platforms—records coordinates every second as the position changes. LRTK can provide centimeter-accuracy coordinates while moving as long as the FIX solution is maintained, but momentary signal interruptions can briefly reduce accuracy. For example, shielding of the antenna by the user’s body or obstacles on rough sites may temporarily cause a FLOAT solution and position offsets of several tens of centimeters. In most cases, however, FIX is recovered within a few seconds after regaining sky visibility, so continuous centimeter-accurate trajectories can be obtained in practical moving surveys. LRTK is optimized for continuous positioning while moving and displays the current solution state (Fix/Float/NG) color-coded on the smartphone so users can monitor accuracy in real time. With proper operation, LRTK yields results within the same accuracy range as conventional equipment whether static or moving.

Differences in peripheral functions and UX such as point-cloud measurement, photos, and AR guidance

While RTK-GNSS devices mainly measure positions, LRTK smartphone surveying provides value beyond simple positioning thanks to rich peripheral functions. Especially point-cloud measurement (3D scanning), geotagged photos, and AR visual guidance deliver features not found in conventional survey instruments, realized through smartphone-centric user experience (UX).

First, point-cloud measurement (3D scanning). Conventionally, acquiring detailed 3D shapes of terrain or structures required expensive laser scanners or a combination of drone aerial photography and ground surveying to generate point clouds. This demanded specialized equipment, multi-person operations, and separate RTK-based control points to reference the point cloud. LRTK integrates these processes: by simply walking with a smartphone in hand you can scan surrounding point clouds. Images and depth information captured by the smartphone camera or LiDAR sensor combine with LRTK’s high-precision position data, and absolute coordinates (latitude, longitude, altitude) are assigned to each point in real time. For example, slope or road point clouds can be acquired on site in a short time and immediately used for as-built management. The ability to perform high-density 3D surveying by a single person without dedicated equipment is a major innovation of LRTK.

Geotagged photo usage is another LRTK-specific function. Photos taken with the smartphone are automatically tagged with the precise coordinates of the location and the camera orientation (azimuth). Tasks that used to require manually plotting camera positions on a map after shooting or using GPS-enabled cameras can now be completed with one tap. Photos, shooting times, and notes are managed together, making it powerful for recording infrastructure inspections or attaching photos to drawings as as-built records. Since smartphones take high-resolution images and make cloud sharing easy, LRTK eliminates the need to manually write positions into paper photo ledgers.

AR-based guidance and visualization are also notable features of LRTK smartphone surveying. By overlaying design positions or target points onto the real-world view on a smartphone or tablet screen, layout tasks and as-built checks become intuitive. For example, when locating stake-out positions indicated by a client, LRTK’s AR guidance displays arrows or markers on the phone screen, and the operator simply walks to the stake position guided by them. It feels like the smartphone becomes a magic window revealing invisible reference points or buried utilities. Traditionally, surveyors had to input coordinates into equipment and find stakes while monitoring distance and direction; AR display enables even novices to find points accurately without confusion. You can also overlay 3D design data onto the current view to share construction images. Because LRTK provides high-precision positioning, AR objects remain stable without shifting even if you move by meters. This enables advanced uses such as inspecting as-built heat maps (color distributions of deviation) on site or pre-visualizing buried pipe locations to avoid them during future excavations.

In terms of usability, smartphone-based LRTK offers many advantages. As mentioned, operation is completed in the smartphone app with a polished GUI that anyone can intuitively use. Positioning data is plotted on a map in real time, so it’s easier to understand visually rather than as a string of numbers. Automatic digital recording eliminates the need for paper field books, preventing mistakes and omissions. The smartphone + small device configuration also has the strength of being an all-in-one field ICT tool: with just an LRTK-equipped smartphone, you can perform surveying, photo recording, point-cloud scanning, plan reference, and AR operations, removing the need to switch equipment on site. These rich peripheral functions differentiate LRTK from conventional equipment and overall improve usability for surveyors and technicians.

LRTK cloud integration and operational advantages

LRTK smartphone surveying also offers excellent benefits for on-site labor reduction and data utilization. Below are LRTK’s features related to cloud integration, mobility, and operational efficiency.

• Efficient surveying and labor reduction: LRTK enables tasks that previously required two people to be performed by one. For example, installing control points, measuring boundary points, and setting out formwork traditionally required one operator and another person holding a staff. With LRTK, a single person can attach the receiver to a pole or monopod and walk to acquire high-precision coordinates sequentially, significantly reducing personnel. This is a major innovation for the construction and surveying industries facing labor shortages and a decline in experienced technicians. Reducing personnel also improves on-site safety: fewer people reduce the burden of surrounding monitoring and help prevent accidents caused by complex communication errors. LRTK is small and lightweight (weight about 150 g; thickness about 1 cm (0.4 in)), so physical burden on workers is minimal, and carrying it in a pocket makes it possible to measure whenever needed, dramatically improving efficiency.

• Real-time data sharing (cloud integration): LRTK systems can immediately upload and share acquired positioning data to the cloud. When you save measurements in the LRTK smartphone app, you can sync to the cloud with one tap, sharing results before returning to the office. Stake points, photos, and generated point-cloud models plotted on a map can be viewed by stakeholders via a web service without dedicated software. This allows remote site supervisors or clients to view measurement status in real time. Even when a single person is surveying, cloud-based access lets the whole team see the latest data, preventing situations where on-site information is siloed. Faster data sharing enables quick detection of missed or incorrect measurements, reducing rework and improving overall quality.

• Lightweight, compact & long endurance: LRTK devices are antenna-and-battery integrated and very compact, yet they provide sufficient toughness and battery life for field use. The device weight is about 125–170 g, so carrying it all day is not burdensome. It’s designed for field use with water- and dust-resistance, and a casing that can be wiped clean. The built-in battery supports about 10–12 hours of continuous positioning on a full charge, covering a typical workday without needing a spare battery. The power-saving design enables roughly 10 hours of operation even when connected via Bluetooth, so combined with a smartphone it can be run stably throughout the day (for extended smartphone use, a mobile battery is recommended). LRTK is both low-power and rugged, making it practical for tough field conditions.

• Wide range of applications: LRTK smartphone surveying has potential applications beyond construction and civil engineering. For example, railway companies that periodically measure track deformation or subsidence can have workers walk along tracks wearing LRTK-equipped helmets to record track displacement with high precision. Highway maintenance teams can record the locations of pavement cracks and equipment during patrols to support repair planning. LRTK can be combined with UAV drones for aerial survey accuracy control, or synchronized with 360° cameras to virtually recreate sites, creating new DX solutions centered on centimeter-accuracy location data. Because LRTK is an easy-to-handle smartphone RTK device, creative on-site uses continue to emerge.

• Ease of introduction: While incorporating cutting-edge positioning technology, LRTK is designed to be easy for general technicians to use. The app displays Japanese menus and operations proceed by following on-screen instructions, with measurement results shown on maps for intuitive understanding. Specialized settings and adjustments typical of conventional surveying equipment are nearly unnecessary; high-precision positioning can start with a few taps. If troubles occur, error messages and guidance appear on screen for calm troubleshooting. Comprehensive introduction support is available from manufacturers, including online assistance and manuals, and free trial plans for a limited period are often provided. Even companies new to RTK can try the device and become proficient with confidence. By making expensive, specialist-only RTK surveying more accessible, LRTK serves as a catalyst for on-site DX.

Simple centimeter-accuracy surveying starting with LRTK

As described above, LRTK smartphone surveying achieves centimeter accuracy comparable to conventional RTK-GNSS equipment while offering many advantages in portability, operability, and extensibility. From an RTK-GNSS comparison perspective, LRTK is innovative in realizing the accuracy and reliability cultivated by conventional systems in a compact smartphone device. This has democratized RTK surveying, which was once seen as expensive and restricted to specialists.

The Ministry of Land, Infrastructure, Transport and Tourism’s i-Construction initiative emphasizes labor savings and accuracy assurance through ICT. LRTK smartphone surveying aligns with this philosophy and is expected to accelerate on-site DX. Actual sites that have introduced LRTK report drastically reduced measurement time for as-built management, personnel reductions, and improved safety. Being able to digitally record and share positional information with a survey instrument that fits in a pocket leads to unprecedented on-site work-style reforms.

If you want to introduce high-precision surveying more easily or manage sites efficiently with fewer people, LRTK is a strong option. With an LRTK-equipped smartphone, even those without specialized knowledge can try centimeter-accuracy surveying from tomorrow. Free trials are often available to experience performance and address pre-introduction concerns with support. Now that barriers have been lowered by the latest technologies, consider adopting LRTK smartphone surveying on your sites. With easy, smart centimeter-accurate positioning, your operations can evolve to the next stage.

FAQ

Q. Why is LRTK necessary instead of just the smartphone’s built-in GPS? A. The smartphone’s internal GPS (GNSS) alone has errors of several meters to more than ten meters and cannot meet the few-centimeter accuracy required for surveying or construction management. LRTK attaches a dedicated high-sensitivity GNSS receiver to the smartphone and uses the RTK method to correct positioning errors, dramatically improving accuracy. By differentially correcting orbit and atmospheric errors that standalone positioning cannot handle, LRTK reduces real-time position offsets to within a few centimeters—transforming an everyday smartphone into a centimeter-accuracy surveying instrument and eliminating the need for traditional specialized surveying equipment.

Q. Do I need a base station or special equipment to use LRTK? A. No—you do not need to prepare your own base station. LRTK supports network RTK, so it receives data via cellular communication from national reference station networks or private correction services through Ntrip. There is no need to set up separate radios or large antennas; a smartphone and an LRTK receiver are sufficient. However, to achieve centimeter-level accuracy you must use correction information services. In areas with cellular coverage, you connect to an Ntrip-compatible correction service (public or private) under contract. In communication-outage areas, you can use satellite augmentation information (Michibiki’s CLAS) supported by LRTK to achieve high-precision positioning without a base station. In all cases, no special hardware beyond the LRTK unit and smartphone is required; necessary correction information is obtained via communication or satellite.

Q. Can I survey in places without cellular coverage? A. Yes. LRTK series devices support the Michibiki CLAS satellite augmentation signal so they can operate outside cellular coverage. Using a coverage-friendly LRTK antenna, you can receive real-time correction data directly from Michibiki satellites even in mountainous or otherwise offline sites, enabling centimeter-level positioning nationwide without base stations. Note that PPP-RTK via satellite augmentation may require a few minutes of convergence at the start of measurement. Allowing sufficient time for satellite reception will achieve high accuracy, so in coverage-outage locations it is advisable to wait a few minutes in open sky before starting work. In any case, the ability to continue surveying without cellular connectivity is a major reassurance.

Q. Which smartphones and tablets are supported by LRTK? A. Currently, iPhone and iPad (iOS) are the primary supported devices, with Android support planned progressively for the latest LRTK devices (some Android models are already supported). Particularly, iPhone 12 Pro and later “Pro” models (with LiDAR scanner) can fully utilize LRTK’s point-cloud scanning and object-positioning features. The recommended device is the latest iPhone 15 Pro for its processing performance and sensor accuracy. Non‑Pro iPhone models and iPads can perform RTK positioning itself, but some advanced AR or scanning features may not be available. Check the LRTK official site for the latest supported devices before introduction.

Q. How long does the battery last? A. The LRTK receiver has a built-in battery and runs for about 10–12 hours on a single full charge (actual time varies with usage and communication conditions). This typically covers a full workday. With a full charge in the morning, you generally won’t worry about battery exhaustion during daytime surveying. Even while connected via Bluetooth to a smartphone, continuous operation of around 10 hours is typical. Charging is via the included USB cable and reaches full charge in about 2.5 hours. Note that the smartphone’s battery will also be consumed during long surveys, and the LRTK device does not provide power to the phone. For long sessions, carrying a mobile battery for the phone is recommended. Overall, LRTK has the endurance to be used all day without worrying about power.

Q. Is positioning accuracy really a few centimeters? A. Yes—actual measurements confirm accuracy of a few centimeters. Using LRTK RTK positioning, under favorable conditions horizontal errors of about 2–3 cm (0.8–1.2 in) and vertical errors of about 3–5 cm (1.2–2.0 in) are commonly achieved, meeting the accuracy required for ordinary surveying tasks. Field tests in open areas found measurement errors generally within 2–3 cm, with differences from design coordinates negligible. In challenging environments such as urban canyons or forests, temporary deviations of around 10 cm (about 4.0 in) can occur, but on average errors remain in the range of a few to a few tens of centimeters—acceptable for construction management. In short, LRTK delivers accuracy comparable to conventional high-end GNSS receivers, but remember that accuracy depends on satellite visibility and environment: the more open the sky, the higher and more stable the accuracy.

Q. Can LRTK be used for creating deliverables for public works such as i-Construction? A. Yes. Coordinates and point-cloud data obtained with LRTK can be output and processed in formats compliant with public standards. The app supports not only geographic coordinates in the World Geodetic System but also conversions to the Geospatial Information Authority of Japan’s plane rectangular coordinate systems (zone-specific) and geoid height calculations, enabling use as official surveying deliverables. Point-cloud data can be verified for accuracy according to Ministry of Land, Infrastructure, Transport and Tourism as-built management guidelines, and error adjustments using control points can be performed if necessary. There are cases where LRTK-derived point clouds were used to prepare inspection documents and submitted as as-built deliverables. LRTK is designed as an i-Construction–compatible solution and can be effectively used in ICT construction and public surveying. Final applicability depends on client requirements, but with centimeter-level accuracy and data-sharing capabilities, LRTK is a useful tool in the public sector.

Q. Do I need specialized knowledge to introduce or operate LRTK? A. No—specialist skills are not required. LRTK is designed to be usable by field personnel without steep learning curves; if you are familiar with smartphone usage, you can learn to operate it quickly. The dedicated app has Japanese interfaces and guides you through from positioning start to recording, so beginners can feel secure. Mode selection and coordinate system settings are presented in simple selectable menus, and high-precision positioning is achievable without in-depth GNSS theory. During introduction you can receive free trials and robust support, with manufacturers and resellers providing initial setup and on-site usage guidance. If questions arise, support contacts are available, making it smooth to adopt RTK technology even for first-time users. LRTK was designed to meet the needs of those who want to perform surveying themselves without relying on specialists.