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OEM RTK Receivers

Septentrio Mosaic

affordable and low power dual/triple band GPS/GNSS RTK boards that allow you to reach millimeter-level accuracy in minutes, based on Septentrio Mosaic. For OEM use and also fully compatible with Arduino, STM32 Nucleo, Raspberry Pi, Nvidia Jetson or as an external GNSS for Pixhawk and Ardupilot.

simpleRTK3B Pro
Up to 100Hz RTK and down to 6mm accuracy with the most affordable L1/L2/L5 board in the market. Powered by Septentrio Mosaic-X5.

simpleRTK3B Heading
Dual antenna L1/L2/E5b RTK rover made simple for Position+Attitude up to 50Hz. Powered by Septentrio Mosaic-H.

simpleRTK3B mPCIe
The Septentrio Mosaic for embedded computers. In standard Mini PCI Express form factor.

simpleRTK3B Micro
The Septentrio Mosaic for small PCB integrators. In a re-usable through hole form factor so you don’t risk it if something goes wrong with your PCB design or assembly.

Key features

What simpleRTK3B boards are capable of

Millimeter level precision
<7mm with a base station up to 35km
<7mm with NTRIP up to 35km
<4cm with SSR corrections
<1.3m in standalone mode
<70cm standalone with SBAS coverage

448 channels and advanced system for interference monitoring and mitigation
• Future proof your design and protect it against jamming with L1/L2/L5 and 448 channels

Raw GNSS measurements & RINEX
Read the raw data from the satellites and generate L1/L2/L5 RINEX files

Radio link flexibility
simpleRTK3B can be used with almost any radio link: WiFi, BT, ISM, 2G/3G/4G… and is compatible with your existing ArduSimple products! Check our store to learn more!

Up to 100Hz RTK (Pro) and 20Hz RTK+Attitude (Heading)
• Track any movement with a latency below 10ms
• Go up to 50Hz Attitude tracking if you don’t need RTK position.

Advanced configurations
• Antenna offset settings
• Upload antenna calibration file
• Compatible with almost anything: heading in HDT format, CMR support, complete RTCM message set
• Work with local coordinate systems thanks to RTCM 1021 & 1023 support

Arduino, STM32, Raspberry Pi and Pixhawk ready
We thought about your DIY needs and we made simpleRTK3B ready to be connected with your favorite development board.
The board is 100% functional by itself and can be connected directly to Pixhawk autopilot to provide centimeter level GNSS.

Multi band and Multi constellation
• Reduces convergence time
• Increases ambiguity fixing rates
• Increases overall cm-level position availability

simpleRTK3B Pro
 GPS: L1C/A, L1C, L1PY, L2C, L2P, L5
• Beidou: B1I, B1C, B2a, B2I
• Galileo: E1, E5a, E5b, E5 AltBoc, E6**
• QZSS: L1C/A, L1C, L2C, L5, L6*
• Navic: L5
* Future firmware upgrade
** RAW data only

simpleRTK3B Heading
 GPS: L1, L2
• Galileo: E1, E5b
• Beidou: B1, B2
• QZSS: L1, L2


everything you need to know about simpleRTK3B boards

Mechanical and variants:

  simpleRTK3B ProsimpleRTK3B Heading 
Dimensions 2D model2D model 
Length x Height 69x53mm69x53mm 
Standard footprint Arduino UNOArduino UNO 
Weight 24g28g 
Mounting holes 33 
GNSS RF connector SMA2 SMA 
GNSS module option Mosaic-X5Mosaic-H 
Case available YesYes 



  simpleRTK3B ProsimpleRTK3B Heading 
Voltage range 4.5-5.5V4.5-5.5V 
Typ current @ 5V 300mA @ 5V300mA @ 5V 
Antenna voltage 3.3V3.3V 
Native interfaces USB-C, UART, MicroSDUSB-C, UART, MicroSD 
Pixhawk connector YesYes 
Sparkfun qwiic NoNo 
Interfaces with acc RS232, EthernetRS232, Ethernet 
Configurable I/O YesYes 
Special function pins TP, EXTINTTP, EXTINT 
Expansion socket 1 1x High Power Xbee1x High Power Xbee 
Expansion socket 2 With Shield accessoryWith Shield accessory 



  simpleRTK3B ProsimpleRTK3B Heading 
Operating Temp -40 to +85°C-40 to +85°C 
Storage Temp -40 to +85°C-40 to +85°C 
CE YesYes 
RoHS YesYes 

RTK Modes

simpleRTK3B supports different operating modes

Standalone simplest way of reaching 1m position accuracy without range limitations
The most basic configuration is to use simpleRTK3B as a standalone GNSS application board.
Connect it to your Arduino, computer or smartphone and enjoy your position in seconds.


Base – rover configuration – get <1cm accuracy with a maximum range of 35km from the base station
Use two simpleRTK3B configured as base station and rover.
Connect the base station and/or rover to your Arduino, computer or smartphone and you will get both positions in seconds.

Base – multiple rovers configuration – get <1cm accuracy with a maximum range of 35km from the base station
Configure one simpleRTK3B as base and broadcast its RTK corrections to both your simpleRTK2B and simpleRTK3B to get centimeter level accuracy.
Connect it to your Arduino, computer or smartphone and you will get your position in seconds.


RTK Heading – get <1cm accuracy and a complete Attitude and Heading Reference system with a maximum range of 35km from the base station
Install simpleRTK3B and get position+heading, or connect to a base station and get RTK+heading.
Connect it to your Arduino, computer or smartphone and you will get your position, attitude and heading in seconds.


Affordable accessories for affordable receivers

Bluetooth module
Want to connect to your brand new simpleRTK3B from your phone/tablet wirelessly? Get this accessory and plug it into the available socket.

WiFi NTRIP Master
If you have access to a WiFi network or a WiFi hotspot, you might want to enable your simpleRTK3B with NTRIP functionality…

Radio Link
Want to connect your new simpleRTK3B with your existing rovers? Or create a Base-Rover kit with 2x simpleRTK3B?

4G NTRIP Client
Add a SIM card and let your simpleRTK3B connect directly to internet: NTRIP Client, Server or even send positions to a server.

Plastic Cases
Make your project look like a pro with our plastic cases and enclosures. Customizable with your own logo at a fee.

Second XBee Socket
Need a second XBee socket to connect 2x of our plugins? 4G+Bluetooth, LR+Bluetooth, LR+WiFi, 4G+RS232, everything is possible!

Raspberry Pi adapter
Make your simpleRTK plug and play with Raspberry Pi. Don’t forget that you will need the headers soldered to use it.

simpleANT antennas
The perfect partner for your simpleRTK board. Low power Multiband RTK GNSS antennas in all shapes and performance levels, at affordable cost.

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