Spherefix SP35 RTK GNSS Rover Set with Laser and AR Stakeout

A Complete RTK GNSS Rover Set for Field Surveying

The Spherefix SP35 Rover Set combines a multi-band RTK GNSS receiver with the C100T Android field controller to create a practical system for coordinate measurement and stakeout. It is designed for land surveyors, construction professionals, civil engineers, GIS teams, utility contractors and drone operators who require centimetre-level positioning without carrying a heavy or complicated setup.

The SP35 can operate as a network RTK rover using corrections received through mobile internet. Its integrated radio also allows it to receive compatible local base-station corrections where a base and rover workflow is preferred. The controller is used to manage the survey project, display maps and points, configure the receiver and record field measurements.

Measure Points That Are Difficult to Reach

Some survey points cannot be occupied directly with a pole. Building corners may be obstructed, trench edges may be unsafe, façades may be inaccessible and utility features may sit behind fences or other obstacles. The SP35 addresses these situations with a camera-assisted laser measurement system.

The operator aims at the required point using the integrated camera and laser while the receiver combines the measured distance with its GNSS position, orientation and tilt information. Within a laser measurement distance of 5 metres, the published three-dimensional error is no more than 2.5 cm. This makes the feature useful for detail collection and site documentation where directly placing the pole on the point is impractical.

AR Guidance for Faster Stakeout

The SP35 uses an integrated ultra-wide-angle camera to provide AR real-scene stakeout. Instead of relying only on arrows and numerical offsets, the operator can see visual guidance over the live camera image while walking towards the design point.

This helps users understand the required direction more quickly, especially on open sites where there are few visual references or on busy construction projects where orientation can be difficult. As the operator approaches the point, the standard north, east and height offsets can be used to complete the final positioning.

Work Without Keeping the Pole Perfectly Vertical

The tightly coupled IMU provides tilt-compensated measurement with positioning accuracy below 2 cm within a tilt range of up to 60°. The pole can therefore be leaned while the receiver calculates the position of the pole tip.

This is useful when measuring beside walls, beneath vegetation, next to machinery or on uneven ground. It also reduces the time spent centring a pole bubble during routine point collection. Because the inertial system does not depend on a conventional magnetic compass, it is less affected by nearby vehicles, steel structures and electrical equipment.

Multi-Band Tracking for Reliable RTK Positioning

The SP35 uses 1,408 channels and supports GPS, GLONASS, BeiDou, Galileo, QZSS, SBAS and NavIC signals. Tracking several constellations and frequencies gives the receiver access to more satellites and can improve the available satellite geometry as the operator moves between different working environments.

Under suitable satellite, correction and site conditions, the receiver offers RTK accuracy of ±(8 mm + 1 ppm) horizontally and ±(15 mm + 1 ppm) vertically. It also supports static GNSS observations for control surveying and post-processing applications.

A data update rate of up to 20 Hz provides responsive coordinate information during moving surveys and stakeout. RTK results still depend on correction quality, satellite visibility, baseline length, multipath and local working conditions, so good field procedures remain important.

C100T Android Survey Controller

The included C100T field controller has a 5.45-inch sunlight-readable touchscreen and a physical keypad for working with surveying software outdoors. Its Android 11 operating system, eight-core 2.0 GHz processor, 4 GB of RAM and 64 GB of storage provide a practical platform for point collection, coding, mapping and stakeout applications.

The 9000 mAh battery is specified for up to 18 hours of operation, helping the controller cover a normal working day. Wi-Fi, Bluetooth and 4G connectivity allow it to communicate with the receiver, access correction networks and transfer project data. The controller is also IP68 rated for use in dusty or wet site conditions.

Flexible Field Communication

The receiver includes 4G mobile data, Bluetooth, Wi-Fi, NFC and a 410–470 MHz UHF/LoRa radio. These options allow the SP35 to work with an NTRIP correction network, a compatible local base receiver or other supported RTK communication setup.

The integrated radio provides selectable 0.5 W and 1.5 W transmission power and supports several widely used radio protocols. Actual radio range depends on terrain, antenna height, interference, local regulations and the equipment used at the base station.

Built for Daily Outdoor Use

The SP35 weighs no more than 780 g, reducing the weight carried at the top of the survey pole. Its magnesium-alloy body is IP68 rated and specified to withstand a two-metre pole drop at room temperature. The receiver has an operating-temperature range of −30°C to +65°C.

A 6500 mAh internal battery provides more than 16 hours of typical operation when the SP35 is used as a GSM rover. The low receiver weight and long battery endurance make the system suitable for full days of point collection, layout and site verification.

Applications for the SP35 Rover Set

Land surveyors can use the set for topographic surveys, boundary measurement, control checks and setting out. Construction teams can use it to position foundations, utilities, drainage, roads, kerbs and structural elements. Civil engineers and site managers can verify completed work or collect progress measurements directly in the field.

GIS crews can record utility assets, chambers, signs, poles, inspection points and environmental features. Drone pilots can use the system to survey ground control points and independent checkpoints for photogrammetry or mapping projects. The visual stakeout and tilt functions also make precise GNSS workflows easier for construction workers who do not operate survey equipment every day.

Buying and Support from Global GPS Systems

A working RTK rover setup requires more than receiver accuracy alone. The system must be compatible with the intended RTK correction network, mobile connection, radio frequency, field software, coordinate system and project workflow. Available set accessories and software configurations should therefore be confirmed when ordering.

Global GPS Systems can help configure the Spherefix SP35 Rover Set for network RTK surveying, construction stakeout, GIS collection, local base use or drone ground-control work. Support is available for controller selection, correction-service compatibility, survey software and practical field setup.