Emlid Reach RS4 is a flagship all-band RTK GNSS receiver with IMU tilt compensation (5-7 seconds init), 672-channel L1/L2/L5/L6 tracking, and quick-release mount. Run as base or rover via NTRIP, UHF (up to 2 W) or LoRa. Magnesium alloy, IP68, and 16-hour battery deliver centimeter accuracy under canopy.
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
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
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.
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
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.
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
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
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.
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
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.
(1) Reach RS4
(1) Carrying Case
(1) USB Type-C Cable
(1) LoRa Antenna 860–930 MHz
(1) UHF Antenna 410–470 MHz
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 |
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.
Emlid Reach RS4 Receiver: Ultimate Precision In Any Conditions
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