Emlid RS4 Pro

Emlid Reach RS4 Pro RTK GNSS Rover

The Emlid Reach RS4 Pro builds on the proven RS4 platform by adding dual Full HD cameras and augmented reality stakeout, enabling faster, safer, and more intuitive surveying workflows. It combines all-band, multi-constellation RTK performance with visual measurement tools, making it ideal for complex sites and locations where physical access is limited.

Use the RS4 Pro for traditional surveying tasks or take advantage of AR guidance and image-based measurements when pole access is restricted. Accuracy, durability, and professional reliability remain at the core of the design.

Discover a New Way to Survey with Dual Cameras

The Reach RS4 Pro features two integrated Full HD cameras that extend surveying beyond conventional RTK workflows.

AR Stakeout for Faster, Clearer Guidance

AR stakeout overlays your design data directly onto the real-world camera view, allowing you to see exactly where points should be placed without interpreting maps or coordinates.

AR stakeout features include:

Dynamic navigation guidance

Auto bullseye view

Cut and fill indicators

Quick point switching

This visual approach helps crews work faster and with greater confidence, even on complex construction sites and roadworks.

Measure Inaccessible Points from Images

When it is not possible or safe to place the pole at a point, the RS4 Pro allows measurements directly from captured images.

Measure:

Building facades

Areas behind fences

Points across busy roads

Restricted or hazardous locations

This reduces the need for total stations and helps keep survey teams out of high-risk areas while maintaining accurate results.

High Accuracy Even Under Canopy

The Reach RS4 Pro delivers centimetre-level accuracy in difficult environments such as forests and urban areas.

Full multi-constellation and multi-frequency GNSS support

L5 and L6 bands for improved resistance to multipath and interference

672 channels tracking over 40 satellites simultaneously

These capabilities ensure stable RTK fixes where other systems struggle.

Next Generation IMU Tilt Compensation

The advanced IMU tilt compensation system maintains precision even at steep angles.

Up to 18 mm precision at 30 degrees tilt

Fast initialization with a few simple movements

No manual recalibration required during operation

Ideal for kerbs, edges, slopes, and confined spaces.

Precision Quick Release Mount

The custom-designed quick release mount locks the receiver securely to the survey pole, eliminating movement that can affect tilt-based measurements.

Secure and repeatable connection

Designed specifically for tilt compensation accuracy

Fast attachment and removal in the field

Flexible Base and Rover Connectivity

NTRIP RTK

Compatible with VRS and single-base CORS networks

Supports RTCM3 correction formats

Use your own base station via Emlid NTRIP Caster

Dual Band Radios

UHF 450 MHz

Transmit and receive

Up to 2W output, licence may be required

Compatible with Reach and selected third-party receivers supporting TRIMTALK 450S

LoRa 915 MHz

Transmit and receive

Up to 1W output, licence-free in North America

Compatible with Reach receivers

Engineered for Harsh Environments

Magnesium Alloy Construction

The RS4 Pro uses a lightweight magnesium alloy body commonly found in aerospace and high-end electronics, offering excellent durability without unnecessary weight.

All Day Battery Life

Up to 16 hours on a single charge

USB-C charging

Power bank support for extended working sessions

IP68 Waterproof and Dustproof

Fully sealed against water, dust, rain, and construction site debris.

Wide Operating Temperature Range

Operates reliably between -40°C and +65°C, suitable for year-round professional use.

Emlid Flow Software for Field and Cloud Workflows

The Reach RS4 Pro is powered by Emlid Flow, a complete mobile and cloud solution available on iOS and Android.

Simple field setup and configuration

Real-time RTK monitoring

Cloud project synchronisation and team collaboration

Export to industry standard formats

Ideal For

Land surveying

Construction and civil engineering

AR assisted stakeout

Mapping and GIS

Drone surveying and ground control points

Restricted or hazardous site work