Description
The Reach RS4 is Emlid’s flagship all-band RTK GNSS receiver designed for survey-grade accuracy in demanding environments. It supports full multi-constellation, multi-frequency tracking and incorporates next-generation IMU tilt compensation so you maintain centimetric accuracy even when your pole is tilted.
With rugged construction, extended battery life, dual radios, and the Emlid Flow ecosystem for field and cloud workflows, RS4 is ideal for professionals in surveying, construction, mapping, and drone control.
High-accuracy, even under canopy
The Reach RS4 can track all available satellite constellations and frequencies, including the lower L5 and L6 bands, which are more resistant to multipath and interference. With 672 channels, it can track 40+ satellites at a time. These features ensure reliable performance and centimeter-level precision.
Next-gen tilt compensation
The Reach RS4 delivers accurate results even at high tilt angles — for example, a 30° tilt still achieves 18 mm precision.1 The compensation mechanism activates with just a few moves and remains stable throughout the survey, saving time and avoiding the need for recalibration.
Quick release mount
This mount is specifically designed for tilt compensation, eliminating backlash and securing the receiver firmly to the survey pole. Even a small amount of wobble between the device and the pole can compromise the accuracy when tilting. The quick-release system provides a fast and reliable connection for maximum precision.
Base and rover
NTRIP
Dual-band radio
UHF 450 MHz
- Transmit and receive
- Up to 2W ( may require a license2 )
- Compatible with Reach and 3rd-party receivers with TRIMTALK 450S support3
LoRa 915 MHz
- Transmit and receive
- Up to 1W ( license-free in North America2 )
- Compatible with Reach receivers
Built to perform in extreme conditions
Magnesium alloy body
The RS4’s magnesium alloy body is as strong as it is lightweight. This material is often used for aerospace equipment and high-end electronics. It strikes the perfect balance of durability and lightness, making it ideal for use in tough conditions while remaining easy to handle.
16 hours on one charge
Waterproof
-40 to +65 ºС
Software for every stage of your project
The Reach RS4 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.
Specifications
Mechanical
Dimensions: 128.6 x 128.6 x 99.3 mm
Weight: 920 g (2.028 lb)
Operating tº: -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
Connectivity
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
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
SIM card: Nano-SIM
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.
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
Number of channels: 672
Update rates: up to 10 Hz
In the Box
1 x Reach RS4
1 x Carrying case
1 x USB Type-C cable
1 x LoRa Antenna 860-930 MHz
1 x UHF Antenna 410-470 MHz