Reach RS4 High Precision GNSS & GPS Receiver | Emlid
All-band RTK GNSS receiver. Ultimate precision, even in the most challenging conditions.
$3899
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Reach RS4
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
7mm + 1 ppm in RTK
672 channels
L1/L2/L5/L6
Fix in less than 5 seconds
GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC

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.
Factory-calibrated
Immune to interference
Faster initialization
No angle limit

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

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 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

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.

First reviews

Joe Douglas, Event 38

The improved signal reception and antenna — that's going to make a big difference to reception under a tree canopy.

Christian Grüner, Andreas Larsen, RTKconnect

With an improved antenna and chipset, it will be even more suitable for working in difficult environments, like near closed buildings and in forests. It will be a game changer!

Matteo Gismondi, Pix4D

The devices really reflect the market's needs. It’s great to see that Emlid has listened to all the feedback and implemented it. The quick release is a dream come true.

Richard Dunlop, Heliguy

The longer battery life and improvements to working under a canopy will be a massive help to users.

Alistair Hart, Mangoesmapping

It's super handy for getting into hard-to-reach places where you just can’t maintain a fix, regardless of tilt. With the sensitivity of the new antenna, we’re going to unlock a whole bunch of possibilities!

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
As-built verification – check constructed structures against your plans

Specification

Reach RS4 Datasheet
135 kb

Mechanical

  • Dimensions 128.6 x 128.6 x 99.3 mm
  • Weight 920 g
  • Operating temperatures -40 to +65 °C
  • 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
    Power
    Distance

     ㅤ
    868/915 MHz
    0.1 W
    Up to 8 km     UHF radio up to 2W

    Frequency range
    Protocols
    Modulation type

     ㅤ
    410–470 MHz
    TRIMTALK 450S**
    GMSK
  • LTE modem Regions
    Bands     Global
    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
  • LTE modem Regions
    Bands     Global
    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
  • *Use the correct antenna, LoRa or UHF, for your setup. **TRIMTALK is a trademark of Trimble Inc.

Data

  • 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

Free lifetime support

Community

Join the Forum and Facebook User Group to connect with Emlid users from around the world and exchange experiences with other experts in your industry.

Expert assistance

When you choose the Reach RS4, you get lifetime access to our expert support team. We're here to help with anything you need within 24 hours or less.
We also provide video tutorials and quick-start guides, so you can learn at your own pace and make the most of your RS4.

Pre-order your Reach RS4 today

Reach RS4

What's inside

Reach RS4, Case, USB-C cable

Pre-order

$3899

Emlid Base and Rover Kit

What's inside

Reach RS4, Reach RS4 Pro, 2x Quick release adapter, Reach RS4 bumper, Reach RS4 Pro bumper

Pre-order

$8870

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Direct Dial: +1 817 865 3334 (ex. 101)

Alternatively, you can text us here:

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FAQ

What makes the Reach RS4 a top receiver for RTK survey work?

The Reach RS4 is an all-frequency GNSS receiver designed for professional RTK survey and mapping tasks. It works with every major GNSS constellations, including GPS, GLONASS, Galileo and BeiDou to deliver an accurate position. Its powerful antenna and built-in GNSS IMU maintain strong signal reception and orientation in challenging environments such as forests or urban canyons. This GNSS device is manufactured by Emlid company to provide high precision and highly accurate results for geospatial and navigation projects.

Does Reach RS4 come with a software?

Yes! The Reach RS4 comes with Emlid Flow and Emlid Flow 360, mobile and cloud app for Reach GNSS receivers. Emlid Flow simplifies project setup, RTK GNSS receiver, base station and correction service configuration, while Emlid Flow 360 offers smooth synchronization of data between the field and the office. In Emlid Flow, you can also record RINEX for PPK workflows.

How can Reach RS4 integrate with other devices?

The RS4 is designed for flexible integration in professional workflows. It can serve as an RTK base station or GNSS base station, broadcasting correction data to UAV, drone, tractor, or GPR systems for real-time kinematic guidance. When used as a rover, it connects to external equipment through its robust connector interfaces, data cables, or Bluetooth, delivering a position stream directly to controllers or autopilots. Its solid enclosure, high-performance antenna, and dependable signal reception make it easy to embed into GNSS solutions, PPK setups, and precision agriculture or mapping platforms — ensuring centimeter-level results across demanding environment.

What level of accuracy does Reach RS4 provide?

Reach RS4 delivers accuracy down to centimeter using advanced algorithms with data from NTRIP correction service reference stations or another GNSS device. Its all-band GNSS antenna, inertial sensor (IMU), and powerful antenna give surveyors an accurate position and attitude information even among buildings or dense vegetation.

Unlike a traditional multi-frequency receiver that only works on a limited set of bands, the RS4 is all-frequency, meaning it can receive every available frequency from supported constellations at once.

What industries and jobs is Reach RS4 good for?

The RS4 is versatile GNSS survey equipment built for land surveyors, GIS specialists, engineers, and construction managers who need highly accurate GNSS receivers. It is also ideal for UAV pilots and operators performing aerial mapping or environmental monitoring. Utilities, telecom, and infrastructure teams use it for asset mapping, precise as-built documentation, and inspection tasks. With its rugged enclosure, reliable signal reception, and versatile capabilities, the RS4 delivers centimeter-level accuracy for a wide range of GNSS applications.

Dedicated technical support from the manufacturer ensures smooth deployment and long-term reliability.

1 – The formula is RTK + 2 mm + 0.3 mm/°, where RTK is 7 mm + 1 ppm. Therefore, with a baseline of 1 km, the formula becomes 7 mm + 1 mm + 0.3 mm × 30° = 18 mm

2 - UHF radio supports transmission power up to 2 W. The exact allowable power level depends on local country regulations, and in many cases, may require a license. LoRa radio supports transmission power up to 1 W. The maximum output also varies by country, but LoRa is optimized to remain within license-free limits in most regions.

3 – TRIMTALK is a trademark of Trimble Inc.