Carlson Viking RTK Rover Set with RT4 Plus Data Collector

Complete Carlson RTK rover solution for professional fieldwork

The Carlson Viking RTK Rover Set with RT4+ brings together Carlson’s high-precision Viking GNSS receiver and rugged RT4+ Windows data collector in one professional rover workflow. Designed for land surveying, construction layout, engineering, GIS and other centimetre-level positioning applications, the set gives field crews both the positioning hardware and the controller needed to measure, stake and record survey data efficiently.

The Viking provides the survey-grade position, while the RT4+ gives the operator access to Carlson SurvPC and the project information required in the field. This separation makes the system flexible: the GNSS receiver remains on the survey pole where it has a clear view of the sky, while the surveyor works from the RT4+ touchscreen to collect points, perform stakeout and manage the job.

Triple Fix GNSS for greater confidence in difficult locations

At the heart of the rover is the Carlson Viking, which uses two GNSS RTK modules and three independent RTK engines. Carlson’s Triple-Fix architecture allows multiple RTK solutions to be calculated and compared rather than relying on a single positioning engine.

This is particularly useful on real construction and survey sites where GNSS conditions are rarely perfect. Buildings, vehicles, machinery, fences and vegetation can block or reflect satellite signals. Having independent RTK calculations available gives the field operator additional information when assessing the quality of a fixed position. Good survey procedures and independent checks are still important, but the system is designed to provide more confidence when working outside completely open-sky conditions.

Centimetre level RTK positioning

The Viking is specified for RTK horizontal accuracy of 0.6 cm + 0.5 ppm and vertical accuracy of 1 cm + 1 ppm under suitable operating conditions. Its 632-channel GNSS system tracks multiple frequencies across GPS, GLONASS, Galileo, BeiDou, QZSS and NavIC.

Multi-constellation tracking gives the receiver access to a large number of satellites, helping maintain useful satellite geometry as the operator moves around a site. The Viking also incorporates technology intended to reduce the effects of multipath and radio interference, both of which are common concerns when surveying close to buildings, metal structures and heavy equipment.

Survey with the pole tilted up to 60 degrees

The integrated IMU provides calibration-free pole tilt compensation up to 60°. Instead of carefully levelling the survey pole for every observation, the operator can place the pole tip directly on the point and allow the receiver to compensate for the pole angle.

This makes everyday measurements faster and makes points that are difficult to occupy vertically much easier to survey. Building corners, kerbs, walls, fences, trenches, utility features and points underneath obstructions can often be measured without repositioning the pole simply to keep the antenna directly above the point.

Carlson RT4 Plus field controller

The Carlson RT4+ acts as the field computer for the Viking rover. It runs Microsoft Windows 11 and uses an Intel N200 processor with 16 GB LPDDR5 RAM and a 256 GB PCIe SSD. This gives the controller enough computing capacity for survey jobs containing coordinate data, CAD information, background maps, surfaces and other project files.

A 7-inch 1280 × 800 high-visibility display is designed for outdoor use. The capacitive touchscreen can be operated with gloves, a suitable stylus and in wet conditions, while physical navigation and programmable keys provide another way to control common field functions.

Built around Carlson SurvPC

Using Carlson SurvPC, the RT4+ becomes the main interface between the surveyor and the Viking. Measurements, coordinate information, stakeout guidance and instrument status can be handled from the same field software. Carlson currently requires SurvPC 7.12 or later for current Viking support.

Typical workflows include topographic point collection, construction stakeout, line and arc stakeout, checking elevations, recording feature information and working with digital project data. Because SurvPC also supports many other GNSS receivers and total stations, the RT4+ can remain useful as a field controller when a company operates several different types of survey equipment.

Fast construction layout and setting out

For construction crews, the rover can be used to take digital design coordinates directly into the field. Operators can navigate to points, lines and other project geometry without relying on tapes or manual offsets for every measurement. Tilt compensation is especially useful around excavations, foundations, kerbs and structures where keeping a conventional GNSS pole perfectly vertical can slow down the work.

The combination is suitable for setting out, position checks, as-built surveys, earthworks measurements and general site control where RTK GNSS accuracy is appropriate for the task.

Land surveying and engineering applications

Surveyors can use the Viking and RT4+ for control work, detail surveys, topographic measurements and stakeout. The rover’s combination of multi-constellation GNSS and tilt compensation is particularly useful when many individual points need to be measured throughout the day.

Civil engineers and site teams can use the same equipment for checking coordinates and elevations against design information. Data collected in SurvPC can then be moved into the wider Carlson software workflow or exported using commonly used survey data formats.

GIS and asset mapping

The rover set can also be used for high-accuracy GIS data collection. Utility assets, inspection points, drainage features, road furniture and other infrastructure can be positioned using the Viking while attributes and project information are managed on the RT4+.

This allows organisations that need more accuracy than the built-in positioning of a conventional tablet to combine centimetre-level RTK measurements with a practical Windows field interface. SurvPC also supports workflows involving Esri ArcGIS Online where the appropriate software and services are configured.

Ground control for drone surveying

Drone mapping teams can use the rover to measure ground control points and independent checkpoints for photogrammetry projects. Instead of relying solely on the drone’s navigation solution, accurately surveyed points can be used to establish or independently verify the coordinate framework of the final dataset.

The Viking can also be reconfigured for base-station applications when required, giving the receiver additional flexibility for organisations using both traditional surveying and RTK drone workflows.

Flexible RTK correction options

As a rover, the Viking requires RTK correction data from a suitable source. Depending on the project and configuration, corrections can be received from an NTRIP network, another compatible GNSS base station or a local UHF radio base. Integrated cellular, UHF, Wi-Fi and Bluetooth communication give the receiver several options for fitting into different field setups.

This is important when choosing a rover set because an RTK rover does not independently create centimetre-level RTK corrections. The available correction network, base station and communication method should therefore be considered when configuring the system for a particular country or project.

Wireless connection between rover and controller

The RT4+ includes long-range Bluetooth 5.3 for communication with compatible survey equipment as well as Wi-Fi 6 and 4G LTE for connected field workflows. This allows the controller to communicate with the Viking without adding unnecessary cables to the survey pole.

Cellular connectivity can also be useful when downloading project information, accessing online services or working with internet-based RTK corrections. Actual connectivity depends on the SIM, network coverage and correction service being used.

Designed for full days outside

Both components are built for professional outdoor use. The Viking has an IP67-rated enclosure and dual removable batteries that can be exchanged in the field. The RT4+ carries an IP68 rating and has a removable 43.2 Wh battery rated for up to 15 hours of operation under specified conditions.

The RT4+ is designed for operation between -20°C and 50°C and uses impact-absorbing external protection around the tablet. Carlson also specifies environmental testing based on MIL-STD procedures for its field hardware. These characteristics make the rover set more appropriate for regular survey and construction use than pairing a professional GNSS receiver with a standard consumer tablet.

One rover for survey construction and GIS teams

The Carlson Viking RTK Rover Set with RT4+ is suited to companies that want a versatile rover rather than a receiver designed around one narrow application. A land surveyor can use it for detail and stakeout work, a construction crew can use it for site layout and as-built measurements, a GIS technician can collect accurately positioned assets and a drone surveyor can establish ground control and checkpoints.

For organisations already using Carlson software, the combination also provides a familiar workflow between field measurements and office processing.

Carlson Viking rover set from Global GPS Systems

Global GPS Systems can help configure the Carlson Viking and RT4+ around the way your team actually works. This includes selecting the appropriate Carlson SurvPC configuration and checking requirements for RTK network corrections, UHF communication, survey poles, mounts and other field accessories.

If you are replacing an existing rover, compatibility with your current RTK correction service or base station can also be considered when choosing the setup. For surveyors, construction professionals, engineers and GIS teams looking for a rugged Windows-based rover with centimetre-level GNSS positioning and advanced tilt compensation, the Viking and RT4+ form a capable complete field solution.