Reach: affordable centimeter-level precise RTK GPS on Indiegogo

Hi all!

We are glad to announce the start of crowdfunding campaign for Reach - compact and affordable RTK GPS receiver, capable of centimeter-level precision.

RTK is a widely used technology well-known in surveying and precision agriculture. Currently available systems cost thousand of dollars and are not affordable to hobbyist, makers and small businesses.


Reach has a tiny Linux computer inside, which runs open-source RTKLIB engine and has comprehensive connectivity options. Bluetooth, Wi-Fi, Serial, USB on-the-go - whatever your application is, integration would be seamless. Reach can be connected to the internet and work independently with NTRIP casters. Here is an example of Reach installed in a vehicle compared to a standalone GPS:

We are working on integration with Pixhawk and other APM based autopilots. Reach can be powered from autopilot port and will send accurate coordinates using NMEA protocol.


Great antennas are the key for RTK performance. Tallysman Wireless, an industry leading company in high accuracy antennas provided their latest advanced antennas for the project. These antennas receive Glonass G1, Beidou B1, GPS L1 and Galileo E1 signals as well as signals from corrections services.

The Emlid Reach program is an excellent example of the potential for huge reductions in cost available of precision RTK positioning systems. Tallysman’s Accutenna™ technology is a great match for the Reach product because it too provides high precision at new price levels.  Just as one wouldn’t expect a high quality image from an expensive TV receiver with a “rabbit ear” antenna, one should not expect the levels of precision the Reach product is capable of with a low precision antenna. Tallysman’s raison d’etre is production of high quality, high precision antennas at an affordable price for systems exactly such as the Emlid Reach product.

Allen Crawford – Director Marketing & Sales, Antennas and RF Products, Tallysman Wireless


Reach highlights:

  • Raw data receiver: U-blox NEO-M8T - 72 channels, output rate is up to 18Hz, supports GPS L1, GLONASS G1, BeiDou B1, QZSS, SBAS, ready for Galileo E1
  • Processing unit: Intel Edison - dual-core 500MHz
  • Connectivity: I2C, UART, GPIO, TimeStamp, OTG USB, Bluetooth, Wi-Fi
  • GNSS Antenna: external with MCX connector
  • Very compact: 25x35mm
  • Lightweight: 20gr


We are now funding the project on Indiegogo platform and early supporters can get an RTK kit with two receivers and Tallysman survey-grade antennas for just 499$.


Views: 6264

Comment by Mikhail Avkhimenia on May 1, 2015 at 9:30am


It probably doesn't matter if the missile will miss a couple of meters.

Comment by Pbreed on May 1, 2015 at 9:43am

How is the swift navigation RTK GPS working out?

Real easy to do L1 RTK on something that is not dynamic, much harder to not have cycle slips on a vibrating moving platform.  Until one of these low cost units includes L2, its not going to work well in a hi vibration Quadcopter environment. 

Comment by Scott Reid on May 1, 2015 at 9:46am

Guys, With all due respect, this discussion is inappropriate for

Comment by johnkowalsky on May 1, 2015 at 9:47am

fair enough scott

Comment by Mikhail Avkhimenia on May 1, 2015 at 9:49am


Unfortunately, price for L2 receivers is too high.

We flew planes with L1 RTK and RTKLIB and the resulting tracks were really smooth. 

Comment by Nikola Rabchevsky on May 1, 2015 at 10:16am

Which model Tallysman antenna are you using for this?

Comment by Thorsten on May 1, 2015 at 10:33am

Hi all,

some questions:

- can BT and WiFi be switched off? 

- what is the weight of the Tallysman antenna?

- what is the (average) time for a lock?

I assume an additional telemetry set is required as well.

Thanks and best regards,


Comment by Mikhail Avkhimenia on May 1, 2015 at 10:43am

@Nikola Rabchevsky

Antenna model is TW4721.


- BT and WiFi can be switched off.

- Weight of the antenna is 50g.

- In the field outside of the city the lock usually takes a few minutes.

We didn't include the telemetry with the kit as some users may prefer to use 3G modems or have special radio requirements. 

Comment by Pbreed on May 1, 2015 at 10:46am

The hardware for L2 recievers is not that much more than that for good L1 recievers, so if you buy dual freq capable hardware with L2 turned off its only a few hundred $, but if you turn on the L2 its at least $1500 more for the "turn on" code. When enough of the GPS sats have been replaced so that L2C is widely available I expect the price of L2 receivers to plummet. (Presently 15 sats send l2c, need to get to 24 before its considered operational)

Comment by Pbreed on May 1, 2015 at 10:52am

>We flew planes with L1 RTK and RTKLIB and the resulting tracks were really smooth. 

A Plane is not a quad copter or Helicopter....

Different dynamics and different vibrations...


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