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Emlid Reach M2

Multi-band RTK GNSS module for precise navigation and UAV mapping


For precise UAV mapping with less GCPs.
Baseline up to 100 km in PPK.


PPK mapping with centimetre accuracy. Use fewer GCPs

Why camera synchronization is so important?

Imagine you are flying your drone at 20m/s with a GPS that works at 5Hz. This means a typical autopilot trigger for your camera will only record position readings every 4m. In addition, there is always a delay between the trigger and the moment the photo is taken, which prevents you from capturing the accurate georeferencing you need.

Reach eliminates the delay

Reach solves the problem of positioning by connecting directly to the camera hot shoe port, which is synced with the shutter. The time and coordinates of each photo are logged with a resolution of less than a microsecond. This method allows GCPs to be used only to check your accuracy.

Fly a drone, Reach will record photo events

1. Connect Reach to a hot shoe port on a camera

Every time a photo is taken camera produces a pulse on a flash hot-shoe connector which is synced to a shutter opening.

2. Fly a drone, Reach will record photo events

Reach captures flash sync pulses with sub-microsecond resolution and stores them in a raw data RINEX log in the internal memory.

3. Download logs from Reach & base station

After the flight, get the RINEX logs from your airborne Reach module and a base station (Reach RS, CORS or another receiver).

4. Process logs & get a file with geotags of photos

Process RINEX files using free RTKLIB software. The produced file with precise coordinates of the photos can be used for georeferencing.

NTRIP or another Reach as a base station

To calculate centimeter-precise coordinates in PPK and RTK, Reach needs corrections from a base station. It could be either another Reach receiver or an NTRIP service. VRS is also supported.



Reach M2 works seamlessly with other Reach receivers over any link and is compatible with any other receiver that supports RTCM3 and NTRIP.

Reach M2

Provides robust performance and quick initialization, allowing work on long baselines.

Up to 60 km


Up to 100 km

Time to fix

5 seconds

Frequency bands


RINEX logging update rate

Up to 10Hz

Comes with
Emlid Flow app

The most user-friendly software for data collection that is available both for Android and iOS. Supports thousands of coordinate systems and is translated into multiple languages. With Emlid Flow, you can control all the features of Reach receivers, such as setting up a base station, logging RINEX data, and configuring NMEA output.


Reach can trigger cameras as well as register events. The event mark feature is a must for aerial mapping as it allows the precise time when the shutter was activated to be registered.

Simple log management

Logs are automatically recorded directly to RINEX in the internal memory. View a list of the logs and download them using the Emlid Flow app.


Emlid Flow shows current satellite levels, your location on a map, and much more.

Reach in action

3DroneMapping completes PPK trials with the average zero mean error in all axes

Luke Wijnberg, 3DroneMapping

As a brief synopsis of the results, the maximum deviation of points was no more than 0.09m in all axes.

This is an incredible result given the fact that the average pixel size of the resulting imagery was 0.045m. The average mean error in all axes is just few mm!

Tuffwing gets 4cm precision without GCPs with Emlid Reach RTK

Brian Christal, Tuffwing

Tuffwing recently performed integration of Emlid Reach RTK to enable precision maps to be made without the use of GCPs. The system has been benchmarked by comparing a direct georeferenced model with a set of GCPs, used solely for error detection purposes. The lateral RMS error achieved is just 4cm according to the Pix4D quality report.

Event38 integrates Emlid Reach and starts providing a ready-to-go PPK mapping solution

Jeff Taylor, Event38

In this case study, we produced an orthomosaic in the Drone Data Management System™ with 2.45cm horizontal and 5.08cm vertical RMSE, as compared with a survey-grade GPS on the ground.

Emlid support

Community forum

Join the Forum and Facebook User Group to get in touch with Emlid team, get tips and insights, and build connections with Emlid users from around the world.

To get help general questions and configuration, contact our application engineers directly via Facebook or WhatsApp.


Quickstart guides and comprehensive feature overview.

Step-by-step tutorials covering most common applications. Regularly updated by our support team based on the most frequently asked questions.




56.4 x 45.3 x 14.6 mm


35 g

Operating tº

-20 to +65 ºC


Power supply voltage on USB or JST-GH connectors

4.75 - 5.5 V

Antenna DC bias

3.3 V

Typical current consumption @5V

300 mA


Static horizontal

4 mm + 0.5 ppm

Static vertical

8 mm + 1 ppm

Kinematic horizontal

7 mm + 1 ppm

Kinematic vertical

14 mm + 1 ppm


LoRa radio (sold separately), Frequency range, Distance

868/915 MHz
Up to 8 km


802.11 b/g/n


4.0/2.1 EDR


USB, UART, Event




Position output


Data logging

RINEX with events
with update rate up to 10 Hz

Internal storage

16 GB


Signal tracked

BeiDou B1I, B2I
Galileo E1B/C, E5b

Number of channels


Update rates

10 Hz GNSS



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