Home / Products / Emlid RTK GNSS / Emlid Reach RS4

All-band RTK GNSS receiver
with tilt compensation

Ultimate precision,
even in the most challenging conditions.

$6999

Reach RS4
High-accuracy in challenging conditions

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.
The compensation mechanism activates with just a few moves and remains stable throughout the survey, saving time and avoiding the need for recalibration.

Emlid Corrections

Emlid Corrections is built into your receiver. No base station, no NTRIP setup — just open Emlid Flow, tap Emlid Corrections, and get centimeter accuracy in seconds.

Your first year of RTK corrections is included. Love it from day one? Lock-in 3 years of savings:

Get 3 More Years

Base and rover

Build a powerful RTK GNSS setup with a single RS4 using an NTRIP service or pair with a second receiver for maximum flexibility. The Reach RS4 is the first Emlid Reach receiver that can both transmit and receive corrections using UHF 450 MHz.

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

UHF 450 MHz

– Transmit and receive
– Up to 2W
– Compatible with Reach & 3rd-party receivers with TRIMTALK 450S

LoRa 915 MHz

– Transmit and receive
– Up to 1W
– Compatible with Reach receivers

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.

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

The RS4 offers an impressive battery life of up to 16 hours on a single charge. Use the USB-C for recharging or use a power bank for even greater flexibility. Designed to keep working as hard as you do, without interruption.

Waterproof

Thanks to its IP68 rating, the RS4 is fully dustproof and waterproof. Whether it's raining, snowing or a dusty construction site, the Reach RS4 will keep working.

-40 to +65 ºС

The Reach RS4 operates in temperatures from -40°C to +65°C. Its performance remains excellent in both freezing cold and scorching heat.

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.

Coordinate your team

Invite team members, share projects and manage access

Monitor field progress from the office and exchange data instantly with real-time sync

One workflow for the whole team, with data that is always up to date, a consistent interface, and no additional training required

Execute projects on site

Topographic surveys – gather terrain and elevation data accurately

Stakeout & layouts – place points, lines, and markers directly in the field

Line & road surveys – stake centerlines and offsets with precision

Cut & Fill calculations – measure earthworks and stockpiles on site

Reach RS4
Emlid LoRa antenna 860-930 MHz
Emlid UHF Antenna 410-470 MHz
USB Type-C cable
Carrying case with a strap

Specification

Reach RS4 Datasheet 135 KB

Dimensions

128.6 x 128.6 x 99.3 mm

Weight

920g

Operating temperature

-40 to + 65 ºC

Ingress protection

IP68

Autonomy

16 hrs as RTK rover with tilt
22 hrs of logging

Battery

Li-Ion 5000 mAh, 7.2 V 36 Wh

Charging

USB Type-C 5 V, 3 A
9V—3A, 12V—3A, 15V—3A

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: 7mm + 1 ppm
V: 14mm + 1 ppm

Tilt

RTK + 2 mm + 0.3 mm/°

Convergence time

~5s typically

Radio

LoRa radio up to 1W
▪ Frequency range 868/915 MHz
▪ Power 1W
▪ Distance Up to 8km

UHF radio up to 2W
▪ Frequency range 410–470 MHz
▪ Protocols TRIMTALK 450S*
▪ Modulation type GMSK

*TRIMTALK is a trademark of Trimble Inc.

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

802.11a/b/g/n

Bluetooth

5.1 (BR/EDR + LE)

Ports

RS-232, USB Type-C

Corrections

NTRIP, RTCM3

Position output

NMEA, LLH/XYZ

Data logging

RINEX, NMEA, LLH/XYZ, UBX

Internal storage

16GB

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