NEO-M8U - u-blox M8 GNSS module with Untethered Dead Reckoning and integrated 3D inertial sensors

The NEO-M8U offers Untethered Dead Reckoning (UDR) technology, eliminating the need for requiring speed information from the vehicle, while providing continuous positioning.

Poor signal conditions (such as urban environments) highlight the benefits of Untethered Dead Reckoning (UDR), even for complete signal loss (parking garages, short tunnels) and for devices with antennas installed within the vehicle.

With UDR, positioning starts as soon as power is applied to the module, before the first GNSS fix is available. The NEO-M8U may be installed in any position within the vehicle without configuration. In addition to its freedom from any electrical connection to the vehicle, the on-board accelerometer and gyroscope sensors result in a fully self-contained solution, making the NEO-M8U ideal for rapid product development with reliable and consistent performance.

Smooth and responsive interactive applications are supported by accurate, real-time positioning at rates up to 20 Hz, as needed for smooth and responsive interactive applications. Native high rate sensor data is made available to host applications such as driving behaviour analysis or accident reconstruction.

In addition, NEO-M8U provides multi-constellation reception via GPS, GLONASS, Galileo, BeiDou and QZSS. A range of interface options (UART, USB, DDC (I2C compliant) and SPI) provide flexible connectivity and enable simple integration with most u-blox cellular modules.

Learn more about Untethered Dead Reckoning


  • World's first untethered dead reckoning GNSS solution
  • Independent of any electrical connection to the car
  • Positioning accuracy in dense cities and covered areas
  • Complete positioning solution with integrated 3D sensors
  • Compatible with all modules of the NEO family
  • Real‑time positioning update rate of up to 20 Hz

For sales and technical development support from our in-house engineering team, please contact the Alpha Micro team.

Parameters Specifications
Receiver type 72-channel u-blox M8 engine GPS/QZSS L1 C/A, GLONASS L10F, BeiDou B1I, Galileo E1B/C SBAS L1 C/A: WAAS, EGNOS, MSAS, GAGAN
Nav. update rate

Up to 20Hz

Position accuracy

2.0m CEP


Cold starts: 26s

Aided starts: 3s

Re-acquisition: 1s


Tracking & navigation: -160dBm¹

Cold starts: -148dBm

Hot starts: -157dBm


AssistNow GNSS Online

AssistNow GNSS Offline (up to 35 days)

AssistNow Autonomous(up to 6 days)

OMA SUPL & 3GPP compliant

Oscillator Crystal
RTC Built in
Sensor on-board accelerometer and gyroscope
Supported antennas Active or passive antennas
Raw data Code phase output
Odometer Integrated in navigation filter

Up to 4 circular areas

GPIO for waking up external CPU

Spoofing detection

Built in

Signal integrity

Signature feature with SHA 256

Data logger

For position, velocity, time and odometer data

¹ Limited by firmware for best dead reckoning performance
Electrical data
Supply voltage 2.7 to 3.6VDC
Power consumption

29mA @ 3.0V (Continuous, default concurrent mode)

Backup supply 1.4 to 3.6VDC
Serial interfaces


1 USBV2.0 full speed 12 Mbit/s

1 SPI (optional)

1 DDC (I²C compliant)

I/O signals 1.8 or 3.3V selectable
Protocols NMEA,UBX binary, RTCM


Mounting 24-pin LCC (leadles chip carrier)

12.2 x 16.0 x 2.4mm

Environmental data, quality & reliability

Operating temperature -40°C to +85°C
Storage temperature -40°C to +85°C
RoHS compliant
Qualification according to ISO 16750
Manufactured and fully tested in ISO/TS 16949 certified production sites
Use u-blox M8 chips qualified according to AEC-Q100


Click here for the u-blox GNSS modules linecard (PDF).

Part No. Description Pack Size
u-blox UDR GNSS module, MSL 4
Reel of 250
EVK-M8U Evaluation kit for NEO-M8U UDR GNSS module Each

EVK-8/EVK-M8 evaluation kits enable simple evaluation of the high performance u-blox M8 positioning technology. The built-in USB interface provides both power supply and high-speed data transfer, and eliminates the need for an external power supply.AlphaMicro_u-blox_EVK-M8N

u-blox 8/M8 evaluation kits are compact, and their user-friendly interface and power supply make them ideally suited for use in laboratories, vehicles and outdoor locations. Furthermore, they can be used with a PDA or a notebook PC, making them the perfect companion through all stages of design-in projects.


  • Easy to use
  • Extensive visualization and evaluation features
  • Supports AssistNow Online and AssistNow Offline A-GNSS services
  • 1 USB port, 1 UART port, 1 I2C/SPI port (switchable)
  • All ports accessible outside
  • Power supply and data transfer over USB (USB V2.0 compatible)

Kit includes:

  • Compact 105 x 64 x 26 mm EVK‑M8 or EVK‑8 unit
  • USB cable
  • EVK‑M8: Active GPS / GLONASS / BeiDou antenna
  • EVK‑8: Active GPS / GLONASS antenna
  • Quick Start reference card

u-center GPS/GNSS evaluation software

The EVK-M8 download includes u-center, which is an interactive tool for configuration, testing, visualization and data analysis of positioning chips and modules. u-center provides useful assistance during all phases of a system integration project.

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Last updated: 23 August 2016