Emlid Reach RS4 Pro: Surveying with AR Magic

Let's be honest, half of surveying is figuring out how to measure something you can't physically touch. Whether it's across a busy road, behind a fence, or up a dodgy-looking wall, it's a pain. The Emlid Reach RS4 Pro is a multi-band RTK GNSS receiver that decided to solve this problem not with more maths, but with cameras and augmented reality. Because pointing your phone at something is infinitely cooler than explaining to a client why a measurement is "estimated".

Why You Want It

Imagine this: you're staking out a site, but instead of staring at a tiny map and some coordinates, you're looking through your phone and seeing the blueprint overlaid on the real world. That's the AR stakeout. It turns a complex job into something that feels suspiciously like a video game. It's faster, more intuitive, and saves so much time your boss might actually notice. This is one of those rare bits of kit where the extra spend on your company card is genuinely, provably, worth it.

Key Features in Exhausting Detail

AR Stakeout & Image Measurement

The Emlid RS4 Pro with AR Magic transforms surveying workflows by combining dual-camera AR visualization with precise GNSS positioning. AR Stakeout projects your designs directly onto the camera feed, pinpointing stake placement with pixel-perfect accuracy. For inaccessible survey points—building corners, distant manholes, or hazardous locations—capture coordinates safely using image-based measurement without leaving your vantage point. This dual-camera system eliminates guesswork, converting traditional surveying into an intuitive visual process that accelerates fieldwork and reduces costly positioning errors.

Next-Gen Tilt Compensation

The Emlid RS4 Pro eliminates tedious levelling procedures through advanced IMU technology that calibrates instantly with a quick motion. Magnetic interference poses no challenge—measure confidently near vehicles and metal structures without performance degradation. Maintain exceptional 18 mm precision even at 30° angles, enabling accurate point capture along wall bases and confined spaces. This intelligent receiver prioritizes productive fieldwork over time-consuming setup, letting surveyors focus on data collection rather than instrument alignment.

All-Band GNSS Support

The Emlid RS4 Pro delivers uncompromising satellite acquisition across all major constellations—GPS, GLONASS, Galileo, BeiDou, and emerging systems. Its 672-channel architecture simultaneously locks 40+ satellites, achieving centimetre-level positioning within 5 seconds. Signal persistence defines this receiver; it maintains reliable fixes beneath dense canopy and within urban corridors where conventional systems falter. Comprehensive multi-frequency tracking (L1/L2/L5/L6) ensures robust performance in challenging environments, extracting positioning data from marginal signal conditions that defeat competing instruments.

Engineered for the Field (and British Weather)

Built from aerospace-grade magnesium alloy, the Emlid RS4 Pro combines structural rigidity with minimal weight penalty. IP68 sealing provides complete environmental protection—dust ingress prevention and full water immersion capability. Extended operational temperature range (-40°C to +65°C) ensures consistent performance across extreme climates. Integrated 16-hour battery endurance supports extended field campaigns, whilst dual radio connectivity (UHF and LoRa) enables flexible base station communication. This instrument withstands demanding construction and surveying environments without compromising measurement integrity or operational reliability.

Reach RS4 Pro – Full Specifications

Mechanical

• Dimensions: 128.6 × 128.6 × 99.3 mm
• Weight: 920 g
• Operating temperature: –40 to +65 °C
• Ingress protection: IP68

Electrical

• Autonomy: 16 hrs as RTK rover with tilt
• Battery: Li-Ion 5000 mAh, 7.2 V (36 Wh)
• Charging: USB Type-C (PD) – 5V/3A, 9V/3A, 12V/3A, 15V/3A

GNSS

• Signal Tracked: GPS: L1C/A, L2C, L5 / GLONASS: L1OF, L2OF / Galileo: E1-B/C, E5a, E6 / BeiDou: B1I, B1C, B2a, B3I / QZSS: L1C/A, L1C/B11, L2C, / L5 / NavIC: L1-SPS Data, L5SPS
• No of channels: 672
• Refresh Rate: Up to 10Hz

Positioning

• Static: H: 4 mm + 1 ppm | V: 8 mm + 1 ppm
• PPK: H: 5 mm + 0.5 ppm | V: 10 mm + 1 ppm
• RTK: H: 7 mm + 1 ppm | V: 14 mm + 1 ppm
• Tilt compensation: RTK + 2 mm + 0.3 mm/°
• Convergence time: ~5 s (typical)

Connectivity

• LoRa radio (up to 1W): 868/915 MHz, 0.1 W, up to 8 km
• UHF radio (up to 2W): 410–470 MHz, TRIMTALK 450S**, GMSK
• LTE modem: Global bands (FDD-LTE, TD-LTE, UMTS, GSM)
• SIM card: Nano-SIM
• Wi-Fi: 802.11 a/b/g/n
• Bluetooth: 5.1 (BR/EDR + LE)
• Ports: RS-232, USB Type-C

Data

• Corrections: NTRIP, RTCM3
• Position output: NMEA, LLH/XYZ
• Data logging: RINEX, NMEA, LLH/XYZ, UBX
• Internal Storage: 16Gb

Imaging

• Image sensors: 1/2.6 in CMOS, global shutter, Full HD
• Field of view: Front: H 64.6° / V 42.8° | Bottom: H 63° / V 42°
• Video frame rate: 25 fps

*Use the correct antenna (LoRa or UHF) for your setup.
**TRIMTALK is a trademark of Trimble Inc.

What’s in the Box*

• 1x Emlid Reach RS4 Pro Receiver
• 1x Dual-Band Radio Antenna (UHF & LoRa)
• 1x USB Type-C Cable
• 1x Quick Release Mount
• 1x Carry Case with Strap

Disclaimer

*Box contents are subject to the whims of global supply chains, but the centimetre-accurate wizard stick is guaranteed.