Reach RS4 Pro – GPS Receiver with Dual Camera & AR | Emlid
All-band RTK GNSS receiver with dual cameras. Visual stakeout and remote point capture for faster and safer work.
$4599
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Reach RS4 Pro. Discover the new way to survey with dual cameras

With two Full HD cameras, the RS4 Pro takes surveying and stakeout further than traditional RTK can.

Stake out faster with AR guidance

With the RS4 Pro, stakeout becomes visual. Rather than simply following coordinates on a map, your designs are directly overlaid on the real world, clearly showing where to place stakes.

  • Dynamic navigation
  • Auto bullseye View
  • Cut & fill indicator
  • Quick point switch

Crews can work faster with AR guidance, even on complex construction sites and roadworks.

Measure from images

Even if you can't put the pole there, you can still measure it with your RS4 Pro. Use the cameras to measure building facades, areas behind fences, across busy roads and any other inaccessible points.

Save time setting up a total station and avoid hazardous areas.

Across water / Behind fences / Over traffic / Above pits / Past hedges / Around machinery

Unmatched precision, even under canopy

The Reach RS4 Pro delivers centimeter-level accuracy, even in challenging environments like forests or urban canyons. With support for every GNSS constellation and signal frequency, including the L5 and L6 bands, resistant to multipath and interference, the Reach RS4 Pro locks onto 40+ satellites simultaneously using 672 channels.
7mm + 1 ppm in RTK
672 channels
GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC
Full-band support: L1 / L2 / L5 / L6
Fix in under 5 seconds

Next-gen tilt compensation

The advanced tilt compensation stays accurate even at steep angles. For example, at a 30° tilt, the Reach RS4 Pro still delivers 18 mm precision.1 Initialization takes just a few quick movements and remains stable throughout the job—no manual recalibration needed.
Factory-calibrated
Interference-proof
Rapid initialization
Unlimited tilt angles

Quick release mount

The custom-designed quick release mount ensures the receiver is locked firmly to your survey pole, eliminating backlash. Even the smallest wobble can affect tilt-based measurements at steeper angles. This mount solves the issue with a fast and rock-solid connection for reliable data accuracy.

Base and rover connectivity

NTRIP

Connect to VRS or single-base CORS networks using RTCM3 format for precise RTK corrections. You can also transmit corrections from your own 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

Engineered for the harshest environments

Magnesium alloy body

Crafted from the same material used in aerospace and high-end tech, the Reach RS4 Pro magnesium body offers exceptional strength without the extra weight. It’s rugged enough for demanding job sites—and light enough for all-day use.

16 hours on one charge

No need to stop mid-job to recharge. The Reach RS4 Pro runs up to 16 hours on a single charge. Power up via USB-C or plug in a power bank on the go—maximum uptime, minimum hassle.

Waterproof

From rainstorms to dusty construction sites, the Reach RS4 Pro is fully ready. With an IP68 rating, it’s completely sealed against water and debris.

-40 to +65 ºС

From cold to heat, the Reach RS4 Pro performs without compromise. Engineered to operate flawlessly between -40°C and +65°C, it’s ready for work anywhere.

First reviews

Maximilian Boosfeld, Wingtra

If I can go high-end, I’ll go high-end. Together, the new hardware and software ecosystem is going to be extremely powerful.

Ugurtan Akyurek, Mangoesmapping

It exceeded my expectations! Collect points where you can’t actually go — it's going to be amazing! We had a job like that before and had to use total stations. Now it's going to be much faster!

Rami Tamimi, The Survey School

This is the new flagship standard — from all bands to the new dual camera system. It has a very modern, compact design and is very easy to use. I can see many applications for us in the surveying industry.

Joe Douglas, Event 38

The Reach RS4 Pro offers future-proofing. You’ll never have to worry about not having the latest and greatest technology, at least for a long time. It will fit in all industries because it has all the necessary features.

Lennart Stollberg, MOST Robotics

When you have a huge project where you need to stake out points, the new AR feature makes it even faster. It cannot get any easier.

Software to drive your entire workflow

The Reach RS4 Pro is powered by Emlid Flow—a complete field and cloud solution for iOS and Android. From initial setup to final verification, Emlid Flow keeps your entire team connected, your data synchronized, and your project on track.

Keep your team in sync

Invite team members, assign roles, and share projects
Monitor field progress from the office and sync data instantly with the field
Unified workflows for all team members, consistent interface, no extra training needed

Handle all types of fieldwork

Topographic surveys: capture precise elevation and terrain data
Stakeout & layout: mark points, lines, and site boundaries
Line & road surveys – stake centerlines and offsets with precision
Cut & fill calculations: measure stockpiles and earthworks on-site
As-builts: confirm construction accuracy against design plans

Specification

Reach RS4 Pro Datasheet
135 kb

Mechanical

  • Dimensions 128.6 x 128.6 x 99.3 mm
  • Weight 920 g
  • Operating temperature -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

Imaging

  • Image sensors 1/2.6 in, CMOS,
    global shutter, Full HD
  • Field of view Front camera
    Bottom camera     H: 64.6°, V: 42.8°
    H: 63°, V: 42°
  • Video frame rate 25 fps

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

Be part of a global network of professionals using Emlid gear. Ask questions and share insights on the Forum and connect with peers in the Facebook User Group.

Expert help

With the Reach RS4 Pro, support doesn’t end after purchase. Our expert team is ready to respond within 24 hours or less, for the lifetime of your device.
You’ll also get access to step-by-step video tutorials, quick-start guides, and documentation to get you up and running quickly.

Pre-order your Reach RS4 Pro today

Reach RS4 Pro

What's inside

Reach RS4 Pro, Carrying case, USB-C cable

Pre-order

$4599

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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Fill in the contact form, and we will reply within a working day (9:00-18:00 CET).

Pre-sale support:
Toll Free: 888-454-1916

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

Alternatively, you can text us here:

sales@emlid.com

FAQ

What industries and jobs is Reach RS4 Pro best for?

The Reach RS4 Pro is a premium tool manufactured by Emild for land surveyors, construction engineers, critical infrastructure specialists, and drone operators who require highly accurate position data. With advanced GNSS technology, robust antenna, all-band and multi-constellation GNSS support, it can also be used in satellite navigation projects, precision agriculture, mapping, and inspection. The receiver provides an IMU module and a dual camera system to help measure hard-to-reach spots and keep you safe from hazardous areas.

Does Reach RS4 Pro come with a software?

Yes. RS4 Pro integrates seamlessly with Emlid Flow and Emlid Flow 360, powerful software platforms for survey and mapping professionals. Together with the hardware, they provide full control over Reach GNSS systems, base and rover management, correction service configuration, and project setup and data collection. Users also benefit from cloud synchronization, recording data for PPK, and various RTK settings for maximum GNSS performance and precise position.

Can RS4 Pro work as a base station or integrate with other devices?

Absolutely. RS4 Pro can serve as an RTK-GNSS base station, streaming corrections, or it can act as a rover providing position output to external hardware. Its flexible architecture, Bluetooth connectivity, and physical connectors allow smooth integration with autopilots, tractors, GPRs, and industrial monitoring systems. Designed as a multi-constellation, all-band receiver, it is a versatile tool for providing GNSS solutions that can be embedded into familiar workflows and navigation system infrastructures.

How does RS4 Pro ensure durability, safety, and long-term reliability?

The RS4 Pro is built with a rugged, IP68-rated, weatherproof enclosure that protects the antenna, IMU module, and overall system in all working conditions. Its interference mitigation features ensure stable data collection even near a power tower or in dense urban environments ensuring accurate position. The built-in battery has a lifespan of up to two working days before it needs to be recharged.

Performance in the field and is backed by responsive technical support from the manufacturer, ensuring long-term reliability and confidence in daily operations.

What level of accuracy does Reach RS4 Pro provide?

The RS4 Pro delivers RTK accuracy with centimeter precision. Its advanced sensor integration, robust antenna, and optimized band GNSS processing give users a stable position. The RS4 Pro provides consistency across projects, whether using RTK corrections (including SBAS), or PPK workflows.

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.