Emlid Reach RS4 Pro

High-Precision GNSS Receiver for Professional Surveying & RTK Workflows

Emlid Reach RS4 Pro

The Emlid Reach RS4 Pro is a premium multi-band GNSS receiver engineered for professional surveying, construction, GIS, and precision agriculture. With next-generation GNSS tracking, lightning-fast RTK/PPK performance, and enhanced tilt compensation, the RS4 Pro delivers centimeter-level results even in challenging environments. Equipped with a long-range LoRa radio, dual-band Wi-Fi, Gigabit Ethernet, and rugged IP68 durability, it is built for demanding field operations while maintaining a simple, intuitive workflow through Emlid Flow and Flow 360.

Flagship Multi-Band GNSS Receiver with Long-Range Connectivity

High-performance Multi-band GNSS
Advanced IMU Tilt Compensation
Integrated Long-range LoRa modem
Portable Size 126×126×150 mm
990 g Weight
IP68 Waterproof, Dustproof, and Shock-resistant body
24 hours Operation
USB-C PD Fast Charging
Key Features

Stake out faster with AR guidance

Dynamic navigation

Auto bullseye View

Cut & fill indicator

Quick point switch

Survey-Grade GNSS Performance

Multi-band GNSS: GPS, GLONASS, Galileo, BeiDou, QZSS

RTK accuracy down to 5 mm + 1 ppm

Ultra-fast fix times with enhanced signal tracking

20 Hz high-frequency positioning output for machine control & robotics

Advanced Tilt Compensation

IMU-based tilt correction up to 60° without loss of accuracy

Faster data collection on steep terrain or obstructed sites

Ideal for measuring points near walls, under obstacles, and in tight spaces

Long-Range Communication & Flexible Connectivity

Built-in LoRa modem with up to 10 km line-of-sight

Dual-band Wi-Fi (2.4/5 GHz) for faster sync

Bluetooth Classic + BLE for device pairing

USB-C, RS-232 serial, and Gigabit Ethernet for enterprise workflows

Rugged for Harsh Environments

IP68 dustproof and waterproof enclosure

Drop-resistant, impact-proof housing

Reliable even in extreme temperatures from –20 °C to +65 °C

Integrated Software Ecosystem

Fully compatible with Emlid Flow (mobile) and Flow 360 (cloud)

Simple coding, stakeout, COGO tools, and project sync

Fast export to CSV, DXF, ESRI SHP, RINEX, and GIS/CAD platforms

Supports RTK & PPK workflows with flexible corrections input/output

In-The-Box
  • Reach RS4 Pro
  • Carrying case
  • USB Type-C cable
  • LoRa Antenna 860-930 MHz
  • UHF Antenna 410-470 MHz
Specs Sheet
Mechanical
Category Specification
Dimensions 128.6 x 128.6 x 99.3 mm
Weight 920 g
Operating temperature -40 to +65 °C
Ingress protection IP68
Dimensions
128.6 x 128.6 x 99.3 mm
Weight
920 g
Operating temperature
-40 to +65 °C
Ingress protection
IP68
Electrical
Category Specification
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
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
Category Specification
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
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
Connectivity
Category Specification
LoRa radio up to 1W Frequency range: 868/915 MHz
Power: 0.1 W
Distance: Up to 8 km
UHF radio up to 2W Frequency range: 410–470 MHz
Protocols: TRIMTALK 450S
Modulation type: GMSK
LTE modem Regions Global
LTE modem 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
LTE modem SIM Card Nano-SIM
Wi-Fi 802.11a/b/g/n
Bluetooth 5.1 (BR/EDR + LE)
Ports RS-232, USB Type-C
LoRa radio up to 1W
Frequency range: 868/915 MHz
Power: 0.1 W
Distance: Up to 8 km
UHF radio up to 2W
Frequency range: 410–470 MHz
Protocols: TRIMTALK 450S
Modulation type: GMSK
LTE modem Regions
Global
LTE modem 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
LTE modem SIM Card
Nano-SIM
Wi-Fi
802.11a/b/g/n
Bluetooth
5.1 (BR/EDR + LE)
Ports
RS-232, USB Type-C
Data
Category Specification
Corrections NTRIP, RTCM3
Position output NMEA, LLH/XYZ
Data logging RINEX, NMEA, LLH/XYZ, UBX
Internal storage 16 GB
Corrections
NTRIP, RTCM3
Position output
NMEA, LLH/XYZ
Data logging
RINEX, NMEA, LLH/XYZ, UBX
Internal storage
16 GB
Imaging
Category Specification
Image sensors 1/2.6 in, CMOS,
global shutter, Full HD
Field of view (Front camera) H: 64.6°, V: 42.8°
Field of view (Bottom camera) H: 63°, V: 42°
Video frame rate 25 fps
Image sensors
1/2.6 in, CMOS,
global shutter, Full HD
Field of view (Front camera)
H: 64.6°, V: 42.8°
Field of view (Bottom camera)
H: 63°, V: 42°
Video frame rate
25 fps
GNSS
Category Specification
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
Number of channels 672
Update rates up to 10 Hz
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
Number of channels
672
Update rates
up to 10 Hz

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