Accurate geospatial data forms the backbone of modern civil engineering, site layout, and infrastructure management. Emlid has launched its flagship receiver—the Emlid Reach RS4. Built with an upgraded 672-channel engine, multi-band tracking (L1, L2, L5, and L6), and a magnetic-immune IMU, the RS4 is engineered to maintain centimeter precision across demanding site environments.
Superior Performance in Urban Canyons and Heavy Canopy
Obstructions, high-voltage lines, and dense vegetation have historically compromised satellite fix reliability. The Reach RS4 resolves these challenges by tracking all major constellations—GPS, GLONASS, Galileo, BeiDou, QZSS, and NavIC—across expanded signal bands. Lower-frequency L5 and L6 signals, coupled with an updated antenna design, improve multipath rejection so field teams can maintain a stable RTK fix with convergence times typically under 5 seconds.
Calibration-Free IMU Tilt Compensation
The RS4 features a factory-calibrated, magnetic-immune Inertial Measurement Unit (IMU) that initializes in just 5 to 7 seconds. Because the algorithm is unaffected by nearby heavy machinery, steel structures, or underground utilities, surveyors can collect points without keeping the pole level.
Speed & Safety: Capture points near open trenches, curb lines, or live traffic without physically standing directly over the feature.
Zero Field Setup: Factory calibration eliminates site setup routines, letting crews take tilt-compensated measurements right out of the box.
High Precision: Tilt compensation adds minimal overhead (RTK + 2 mm + 0.3 mm/°), keeping measurements well within strict tolerance limits.
Comprehensive Hardware Specifications
| Specification | Details |
| Channels & Constellations | 672 channels (GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC) |
| Frequency Bands | L1, L2, L5, L6 |
| RTK Precision | Horizontal: 7 mm + 1 ppm | Vertical: 14 mm + 1 ppm |
| Static & PPK Precision | Static: H: 4 mm + 0.5 ppm, V: 8 mm + 1 ppm | PPK: H: 5 mm + 0.5 ppm, V: 10 mm + 1 ppm |
| Internal Storage | 16 GB |
| Battery Life | Up to 16 hours (RTK rover with tilt enabled) / 22 hours (static logging) via USB-C |
| Radios & Cellular | Dual-band: UHF (410–470 MHz up to 2W) & LoRa (868/915 MHz up to 1W) + Global 4G LTE modem |
| Enclosure & Durability | Lightweight magnesium alloy, IP68 dust/waterproof, operating range: -40°C to +65°C (-40°F to 149°F) |
| Weight & Dimensions | 920 g (2.03 lb); 128.6 × 128.6 × 99.3 mm |
Connected Field-to-Cloud Workflows
Beyond hardware specs, the Reach RS4 streamlines operations through software integration. Operating with the Emlid Flow mobile app (iOS/Android) and Emlid Flow 360 cloud platform, field data synchronizes directly with office teams in near real time.
Topographic & As-Built Surveys: Record ground surface points, stockpiles, and finished structures.
Site Layout & Stakeout: Import DXF or CSV files and perform stakeouts with real-time visual guidance.
Flexible Correction Delivery: Operate as a local base station over UHF or LoRa, connect to NTRIP networks via internal LTE, or log raw RINEX files for post-processing.
Whether executing earthwork calculations, locating subsurface utilities, or mapping boundary lines, the Emlid Reach RS4 provides a rugged, highly reliable solution for modern geospatial workflows.
For a visual overview of how the receiver performs in tough field environments, check out the Emlid Reach RS4 Product Overview Video. This short demonstration highlights how the multi-band antenna and tilt-compensation handle heavy canopy and urban obstructions.
