Emlid Reach RS4

High-Precision GNSS Receiver for Surveying and RTK Applications

Emlid Reach RS4

The Emlid Reach RS4 is a high-performance GNSS receiver designed for professional surveying, mapping, and precision agriculture. With multi-band GNSS support, tilt compensation, and an integrated radio modem, it provides centimeter-level accuracy in the field without the need for complex setups. Built with a rugged IP68 housing and long battery life, the Reach RS4 delivers reliable RTK performance for land surveyors, construction teams, and GIS professionals.

High-accuracy, Even Under Canopy

Multi-band RTK GNSS receiver
Supports NTRIP, LoRa, and Base/Rover
Mapping Capability High Altitude, Long-range
Small Form 126×126×142 mm
950 g Weight
IP68 Waterproof, Dustproof, and Shock-resistant
22 hours Continuous Operation with Single Charge
Key Features

High-Precision GNSS Performance

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

Centimeter-level RTK accuracy for surveying and GIS mapping

Fast RTK fix times under challenging environments

Tilt Compensation

Survey at up to 60° tilt without losing accuracy

IMU-based correction ensures stable precision in the field

Ideal for measuring inaccessible or obstructed points

Connectivity & Communication

Integrated LoRa radio modem with 8 km line-of-sight range

NTRIP and TCP/IP support for base-rover configurations

Bluetooth, Wi-Fi, and USB-C connectivity

Field Durability & Power

IP68-rated rugged housing for dust, water, and shock resistance

Operates in harsh field conditions and extreme temperatures

Up to 22 hours of battery life; charges via USB-C or power bank

Software Integration

Fully compatible with Emlid Flow, Emlid Flow 360, and ReachView 3

Supports Android, iOS, and web-based access

Data export in industry-standard formats (CSV, DXF, ESRI SHP, RINEX)

In-The-Box
  • Reach RS4
  • 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 temperatures -40 to +65 °C
Ingress protection IP68
Dimensions
128.6 x 128.6 x 99.3 mm
Weight
920 g
Operating temperatures
-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
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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