Emlid Reach RS4

Emlid Reach RS4 is a flagship all-band RTK GNSS receiver built for speed and reliability. Its next-generation IMU delivers tilt compensation with centimeter precision, initializing in about 5 to 7 seconds; a quick-release mount preserves accuracy. A 672-channel engine and antenna track L1/L2/L5/L6 across GPS, GLONASS, Galileo, BeiDou, QZSS, and NavIC. Run as base or rover via dual-band radios: UHF (up to 2 W where licensed) and LoRa (up to 1 W). Magnesium alloy, IP68, and −40 to +149 °F (−40 to +65 °C) for year-round fieldwork. High-Accuracy, Even Under Canopy Your browser does not support our video. The Reach RS4 tracks every major constellation and band—including L1/L2/L5/L6—on a 672-channel engine. Lower-frequency L5/L6 signals and a redesigned antenna improve multipath resistance, so you keep a stable fix beneath tree cover and in reflective urban sites while tracking 40+ satellites concurrently. RTK precision: H: 7 mm + 1 ppm (≈ 0.28 in + 1 ppm), V: 14 mm + 1 ppm (≈ 0.55 in + 1 ppm). Fix time: typically under 5 seconds. All-band GNSS: L1/L2/L5/L6 GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC 672 channels with improved antenna design Centimeter-level results in canopy and dense urban environments Fast initialization for rapid first fix Next-Gen Tilt Compensation Your browser does not support our video. Work accurately without leveling. The Reach RS4 maintains centimeter precision while the pole is tilted, with a typical specification of RTK + 2 mm + 0.3 mm/°. The compensation mechanism activates with a few quick moves and stays stable through the session, so you keep moving even in tight corridors and near obstructions. Fast start, no recalibration. Initialization typically takes 5–7 seconds. Each unit is factory-calibrated, so there is no field calibration to manage. Designed for difficult environments. The IMU is immune to magnetic interference, which helps maintain accuracy around vehicles, steel structures, and electronics. There is no practical angle limit for the algorithm within normal field use. Example performance: ~18 mm at 30° tilt (≈ 0.71 in). Typical spec: RTK + 2 mm + 0.3 mm/° tilt error. 5–7 s initialization; remains stable during long surveys. Factory-calibrated; no user calibration required. Magnetically immune IMU for urban and industrial sites. Quick Release Mount The RS4 quick release mount is engineered for tilt workflows. A backlash-free thread and keyed interface lock the receiver to the survey pole, removing wobble that could bias the IMU during tilt. Attachment is fast and repeatable, and the rigid coupling keeps geometry stable through rotation, stakeout, and transport. Base and Rover NTRIP Run RTK in RTCM3 via VRS/CORS networks, or set another GNSS as an NTRIP base using Emlid NTRIP Caster. Emlid Corrections Powered by Point One Navigation, Emlid Corrections, is a VRS RTK correction service built into Emlid receivers. It delivers 1-2 cm horizontal and vertical accuracy over the internet, no base station required, no NTRIP configuration needed.  The service is activated directly in Emlid Flow — either by claiming the included free year, or by entering a purchased license key.* Compatible devices: Reach RX2, RS4, RS4 Pro, RS3, RX, RS2, RS2+  *Emlid Corrections is activated through Emlid Flow — either by claiming the included free year, or by entering a license key. Once active, corrections are delivered automatically with no manual NTRIP setup. Each license is tied to a single device and is non-transferable. The license is global — it covers all regions currently supported by the network, including any future expansions. The service is currently available in US, Europe, Australia, New Zealand and many other countries. Review the coverage map for more supported regions.  Dual-Band Radio UHF 450 MHz Transmit and receive corrections. Up to 2 W output (licensing may be required by local regulations). Compatible with Reach and third-party receivers supporting TRIMTALK 450S. LoRa 915 MHz Transmit and receive corrections. Up to 1 W output (optimized for license-free use in North America). Interoperable with Reach receivers for simple base–rover links. Built to Perform in Extreme Conditions Magnesium Alloy Body The RS4 uses a magnesium-alloy enclosure for high strength at low weight. This premium material is common in aerospace and high-end electronics and holds up to jobsite abuse without adding bulk. 16 Hours on One Charge Work a full day without swapping gear. RS4 runs up to 16 hours on a single charge and tops up via USB-C or a power bank for flexible recharging in the field. Waterproof and Dustproof Rated IP68 for sealed, weatherproof operation in rain, snow, and dusty construction environments. Keep surveying when conditions turn rough. Wide Operating Temperature Engineered for year-round use from −40 to +65 °C (−40 to +149 °F) without compromising performance or stability. Software For Every Stage Of Your Project Your browser does not support our video. Emlid Flow pairs with the Flow 360 cloud to keep devices, projects, and code lists in sync on iOS and Android. Field updates appear in the office in near real time, so teams stay aligned and work from the same, current dataset. Coordinate Your Team Invite teammates, share projects, and control access. Track field progress from the office and exchange files without email or manual merges. A single, consistent interface reduces training time and keeps crews productive. Add users, assign permissions, and share active jobs. View project status and sync changes instantly between field and office. One workflow across the team with always up-to-date data. Execute Projects On Site Use Flow tools to set up the receiver, collect features, create linework, and stake designs with confidence. Results are organized for fast handoff to the office. Topographic surveys for terrain and elevation capture. Stakeout and layouts for points, lines, and markers. Line and road surveys for centerlines, offsets, and curves. Cut and fill calculations for earthworks and stockpiles. As-built verification against design plans. Use Cases Land Surveying & Construction Pair Reach RS4 with Emlid Flow to handle everyday and advanced site work with speed and consistency. Teams stay aligned through shared projects and real-time sync, while the receiver’s all-band tracking and fast tilt compensation maintain accuracy in tight, obstructed areas. Drone Mapping Use RS4 as a base station for RTK or for PPK post-processing with logged RINEX files. Dual-band radios and NTRIP support provide flexible correction delivery on varied sites, and improved multipath resistance helps when placing control near canopy or reflective surfaces. In the Box (1) Reach RS4 (1) Carrying Case (1) USB Type-C Cable (1) LoRa Antenna 860–930 MHz (1) UHF Antenna 410–470 MHz (1) Free Year of Emlid Corrections Specs Emlid Reach RS4 Specifications Positioning Precision — Static H: 4 mm + 0.5 ppm V: 8 mm + 1 ppm Precision — PPK H: 5 mm + 0.5 ppm V: 10 mm + 1 ppm Precision — RTK H: 7 mm + 1 ppm V: 14 mm + 1 ppm Convergence time ~5 s typically Tilt compensation RTK + 2 mm + 0.3 mm/° Update rate Up to 10 Hz GNSS Signals 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, L5-SPS Number of channels 672 Connectivity Cellular (LTE modem) Regions: Global FDD-LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 18, 19, 20, 26, 28 TD-LTE: 38, 39, 40, 41 UMTS: 1, 2, 5, 8 GSM (Quad-band): 850 / 900 / 1800 / 1900 MHz SIM: Nano-SIM LoRa radio 868 / 915 MHz, 0.1 W, up to 8 km UHF radio 410–470 MHz; Protocol: TRIMTALK 450S; Modulation: GMSK Wi-Fi 802.11 a/b/g/n Bluetooth 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 16 GB Mechanical Dimensions 128.6 × 128.6 × 99.3 mm (5.06 × 5.06 × 3.91 in) Weight 920 g (2.03 lb) Operating temperatures −40 to +65 °C (−40 to 149 °F) Ingress protection IP68 Electrical Autonomy Up to 16 hrs as RTK rover with tilt; up to 22 hrs logging Battery Li-Ion 5000 mAh, 7.2 V, 36 Wh Charging USB Type-C (PD): 5 V—3 A, 9 V—3 A, 12 V—3 A, 15 V—3 A FAQ What Makes The Reach RS4 A Top Receiver For RTK Survey Work? Reach RS4 is an all-band GNSS receiver with a 672-channel engine and L1/L2/L5/L6 support across GPS, GLONASS, Galileo, BeiDou, QZSS, and NavIC. A high-performance antenna and IMU tilt compensation keep a stable fix under canopy and in reflective urban sites, delivering centimeter-level RTK with typical fix times under 5 seconds. Does The Reach RS4 Come With Software? Yes. Emlid Flow (iOS/Android) and Flow 360 (cloud) handle device setup, base/rover and NTRIP configuration, coding, linework, stakeout, and real-time project sync between field and office. You can also record RINEX for PPK workflows. How Can Reach RS4 Integrate With Other Devices? RS4 can operate as a base or rover. It streams positions (e.g., NMEA) over Bluetooth or USB/RS-232 to data collectors, controllers, and compatible autopilots, and it delivers corrections via NTRIP, UHF, or LoRa. The rugged enclosure and improved antenna make it a dependable component inside survey, mapping, agriculture, and machine-control stacks. What Level Of Accuracy Does Reach RS4 Provide? In RTK, typical specification is H: 7 mm + 1 ppm (≈ 0.28 in + 1 ppm) and V: 14 mm + 1 ppm (≈ 0.55 in + 1 ppm), with convergence usually under 5 seconds. Tilt compensation is specified as RTK + 2 mm + 0.3 mm/°, enabling accurate shots at practical pole angles without bubble leveling. What Industries And Jobs Is Reach RS4 Good For? RS4 suits land surveyors, GIS specialists, and construction teams that need dependable centimeter-level results in real-world conditions. Common tasks include fast layout, topo surveys, as-builts, checkpoints, and small road work. As a base station, it also supports drone mapping/control points and reliable PPK data capture. Videos Emlid Reach RS4 Receiver: Ultimate Precision In Any Conditions