Why Surveyors Are Switching to the Emlid Reach RS4 Pro
"Why did I spend $20-30k on a competitor's receiver when the RS4 Pro delivers the same performance?" It's the question we hear often from customers who've made the switch from Trimble™, Leica™, Topcon™, and others. Advanced features found only in premium-priced systems. Professional-grade accuracy at a fraction of the cost. Plus a fully-featured mobile data collector app for $35/month instead of thousands in hardware and annual licensing fees...
The industry has long dictated that premium performance demands premium pricing. Emlid disrupted that narrative. The RS4 Pro delivers enterprise-level accuracy without the enterprise-level cost. For professionals ready to challenge conventional wisdom, the value proposition is undeniable—superior performance, lower total cost of ownership, and the freedom to reinvest savings into your business.
Dual Camera Stakeout & Image-Based Measurement
With two Full HD cameras, the RS4 Pro takes surveying and stakeout further than traditional RTK can. The RS4 Pro shares its all-band GNSS engine, multi-frequency tracking, and advanced tilt compensation with the standard Reach RS4. The differentiator is the dual Full HD camera system, enabling augmented reality stakeout and image-based measurement workflows
Stake
Out
Faster
Measure
From
Images
Centimeter Accuracy in Tough Conditions – L5 & L6 Multipath Rejection
The Reach RS4 Pro GNSS receiver tracks all satellite constellations and frequencies, including L5 and L6 bands for superior multipath rejection. With 672 channels and 40+ satellite tracking capability, the Reach RS4 delivers centimeter-level positioning accuracy and reliable performance in challenging environments where other receivers struggle.
Advanced Tilt Compensation – Survey at Any Angle
Reach RS4 Pro Tilt Compensation
The Reach RS4 Pro delivers accurate results even at high tilt angles — for example, a 30° tilt still achieves 18 mm precision. The compensation mechanism activates with just a few moves and remains stable throughout the survey, saving time and avoiding the need for recalibration.
Factory-calibrated
Immune to interference
Faster initialization
No angle limit
REACH RS4 PRO
RS4 Pro Quick Release Mount for Tilt Compensation
This mount is engineered for tilt compensation, eliminating backlash and locking your receiver securely to the survey pole. Even minimal wobble between device and pole can reduce accuracy during tilting operations. The quick-release mechanism delivers fast, dependable connection for consistent precision.
Use the RS4 Pro as a Base or Rover
Connectivity – NTRIP, UHF Radio & LoRa
NTRIP
Work in RTK with VRS or a single baseline CORS network in RTCM3 format. You can also connect another GNSS receiver as an NTRIP base using Emlid NTRIP Caster
Dual-band radio
UHF 450 MHz
- Transmit and receive
- Up to 2W (may require a license)
- Compatible with Reach and 3rd-party receivers with TRIMTALK 450S support
LoRa 915 MHz
- Transmit and receive
- Up to 1W (license-free in North America)
- Compatible with Reach receivers
Who Is the Emlid Reach RS4 Pro For?
Land surveyors replacing aging Trimble™, Leica™, or Topcon™ receivers without the $30,000+ price tag, construction contractors needing centimeter-accurate stakeout and as-built verification, drone operators who want a single receiver that doubles as a PPK base station and a GCP rover, and civil engineers working under tree canopy or in urban environments where multipath rejection matters all benefit from a solution that delivers professional-grade performance. If you've been quoted $20–30k for a competitor's receiver and wondered if there's a better way — there is.
Aerospace-Grade Magnesium Alloy Construction
Built with premium magnesium alloy—the same material trusted in aerospace and high-performance electronics—the RS4 delivers exceptional strength without the weight. Lightweight yet durable construction ensures reliable performance in demanding field conditions.
16-Hour Battery Life for Full-Day Surveying
Power through your longest workdays with confidence. The RS4's optimized power management system delivers all-day performance, minimizing downtime and maximizing productivity in the field.
IP68 Waterproof & Dustproof – Built for the Field
Work with confidence in any weather condition. The RS4's IP68-rated waterproof design protects against dust, rain, and submersion, ensuring reliable operation in challenging outdoor environments.
Operates from -40°C to +65°C
Engineered to perform in extreme conditions from -40°C to +65°C. Whether surveying in arctic cold or desert heat, the RS4 maintains precision and reliability across the full temperature spectrum.
Emlid Flow App – Use Your Phone as the Data Collector
The Reach RS4 Pro comes with Emlid Flow, a comprehensive mobile and cloud solution compatible with both iOS and Android. It keeps your team aligned and your projects on track while supporting various site tasks.
Emlid Reach RS4 Pro vs RS4 vs RS3
| Feature | RS3 | RS4 | RS4 Pro |
|---|---|---|---|
| All-band GNSS | ✓ | ✓ | ✓ |
| L5 / L6 bands | – | ✓ | ✓ |
| Tilt compensation | Basic | Advanced | Advanced |
| Dual cameras | – | – | ✓ |
| AR stakeout | – | – | ✓ |
| LoRa radio | ✓ | ✓ | ✓ |
| UHF radio (transmit) | – | ✓ | ✓ |
| UHF radio (receive) | ✓ | ✓ | ✓ |
Frequently Asked Questions about the Emlid Reach RS4 Pro
The RS4 and RS4 Pro have identical GNSS performance, identical constellation and frequency tracking (including L5 and L6 bands), and the same advanced tilt compensation. The only difference is the dual Full HD cameras on the RS4 Pro, which enable augmented reality stakeout and image-based measurement. If you don't need the visual stakeout workflow, the RS4 delivers the same centimeter-accurate positioning at a lower price.
Yes. The RS4 Pro functions as either a base or a rover, with NTRIP, UHF radio (450 MHz, up to 2W), or LoRa (915 MHz, up to 1W, license-free in North America) for transmitting corrections.
Emlid Flow on iOS and Android is included. It's also compatible with Esri ArcGIS Field Maps, QField, Survey123, and other third-party apps via Bluetooth NMEA output.
16 hours as an RTK rover with tilt compensation active. Charges via USB-C Power Delivery.
Yes. Set up the RS4 Pro as a base, log raw GNSS data in RINEX format to internal storage (16 GB), and post-process against your drone flight data.
The 915 MHz LoRa radio is license-free in North America. The 450 MHz UHF radio at higher power output may require a license depending on jurisdiction.
Yes. Northern Plains is an authorized Emlid dealer. Your unit ships with full Emlid warranty, and we handle warranty claims directly so you don't have to deal with overseas support queues.
Each Emlid Reach RS4 Pro ships with: Reach RS4 Pro receiver, Carrying case, USB Type-C cable, LoRa antenna (860–930 MHz), UHF antenna (410–470 MHz).
Emlid Reach RS4 Pro Specifications
Imaging
Image sensors
1/2.6 in, CMOS, global shutter, Full HD
Field of view
Front camera: H: 64.6°, V: 42.8°
Bottom camera: H: 63°, V: 42°
Bottom camera: H: 63°, V: 42°
Video frame rate
25 fps
Mechanical
Dimensions
128.6 x 128.6 x 99.3 mm
Weight
943 g (2.08 lb)
Operating temperature
-40 to +65 °C (-40 to 149 °F)
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
Positioning
Static
H: 4 mm + 0.5 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 typically
Data protocols
Corrections
NTRIP, RTCM3
Position output
NMEA, LLH/XYZ
Data logging
RINEX, NMEA, LLH/XYZ, UBX
Internal storage
16 GB
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, L5-SPS
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
Update rates
up to 10 Hz
LoRa radio
Power
up to 1W
Frequency range
868/915 MHz
Output power
0.1 W
Distance
Up to 8 km
UHF radio
Power
up to 2W
Frequency range
410 - 470 MHz
Protocols
TRIMTALK 450S**
Modulation type
GMSK
LTE modem
Regions
Global
Bands
FDD-LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 18, 19, 20, 26, 28
TD-LTE: 38, 39, 40, 41
UMTS (UHPS/FDD): 1, 2, 5, 8
Quad-band, 850/1900, 900/1800 MHz
TD-LTE: 38, 39, 40, 41
UMTS (UHPS/FDD): 1, 2, 5, 8
Quad-band, 850/1900, 900/1800 MHz
SIM card
Nano-SIM
Connectivity
Wi-Fi
802.11 b/g/n
Bluetooth
Bluetooth 5.1 (BR/EDR + LE)
Ports
RS-232, USB Type-C
*Use the correct antenna, LoRa or UHF, for your setup.
**TRIMTALK is a trademark of Trimble Inc.
**TRIMTALK is a trademark of Trimble Inc.