RS4 Pro

Step into the next generation of survey and stake-out equipment with the Reach RS4 Pro — a high-end all-band, multi-constellation RTK GNSS receiver designed for demanding fieldwork. Built for professionals who demand speed, precision and reliability, this tool brings advanced features like dual-cameras with augmented reality (AR) guidance, ultra-accurate tilt-compensation, and rock-solid ruggedness for the toughest sites.

Key Features & Benefits

Visual Stake-out and Site Work
With two Full HD cameras integrated into the unit, the Reach RS4 Pro transforms stake-out from reading points on a screen to visually placing them in the real world. Your designs are overlaid on the field via AR guidance, making layout faster and more intuitive — even on complex construction sites and roadworks. 
If a point is behind a fence, across water or in a hazardous zone—no problem. Simply use the cameras to capture and measure from a safe vantage. 

Centimetre-level Accuracy Even in Tough Environments
Tracking over 40 satellites across six constellations (GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC) with 672 channels and support for full band (L1/L2/L5/L6), this receiver excels in challenging areas such as urban canyons or under canopy. 
RTK horizontal accuracy is approximately 7 mm + 1 ppm, with rapid initialization (under ~5 seconds typical). 

Advanced Tilt Compensation
No need to keep the pole perfectly vertical. The Reach RS4 Pro maintains high accuracy with tilt compensation — for example, at a 30° tilt the positional error remains around 18 mm. 

Robust Design Built for Real-World Use

• Housed in a magnesium alloy body for strength without excessive weight. 

• IP68 rated for full protection against dust and immersion — ready for rain, mud and heavy site conditions. 

• Operating temperature range from –40 °C to +65 °C ensures performance in extreme climates. 

• Up to 16 hours of runtime on a single charge, powered via USB-C and compatible with power banks for field longevity. 

Flexible Connectivity & Use Modes
Whether you’re working as a rover or as a base, the RS4 Pro supports:

• NTRIP/RTCM3 for corrections from VRS or CORS networks. 

• Internal LoRa or UHF radio for base/rover setup without external devices. 

• Integration with external hardware via Bluetooth, USB, RS-232 — ideal for autonomous systems, tractors, drone workflows and more. 

Workflow Integration with Software
Paired with the Emlid Flow ecosystem (mobile + cloud), you gain a full workflow solution: site setup, data collection, team coordination, cloud sync, and as-built verification—all from field to office. 

Ideal For

Survey firms, civil contractors, infrastructure inspectors, drone mapping operators, and any professionals who demand high precision, fast stake-out, and versatile measurement in challenging environments.

Technical Highlights (excerpt)

• Channels: 672 simultaneous GNSS channels. 

• RTK Accuracy: ~7 mm + 1 ppm (horizontal) typical. 

• Tilt Compensation: e.g., ~18 mm error at 30° tilt. 

• Runtime: Up to 16 hours as RTK rover with tilt compensation. 

• Ingress Protection: IP68; Operating Temp: –40 to +65 °C. 

• Storage: 16 GB internal; various connectivity options including WiFi, LTE, Bluetooth, USB-C. 

Why Choose It?

When you’re working in complex sites where time matters and precision is non-negotiable, the Reach RS4 Pro stands out by combining premium GNSS performance with modern measurement tools (dual-camera, AR guidance, tilt compensation) in a rugged, all-day package. For companies looking to boost productivity, reduce total station setup time, or safely measure hard-to-access points, it offers a compelling all-in-one solution.

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