BZ251 M10 Multi GNSS GPS Compass Module QMC5883 5.0V UART I2C 10Hz for F405 F722 FPV Racing Drones Fixed Wing UAV Return to Home

BZGNSS BZ-251 M10 Multi-GNSS GPS Module with QMC5883 Compass

Fast Positioning · Accurate Heading · Compact Design

The BZGNSS BZ-251 is a compact multi-GNSS positioning module designed for FPV drones, fixed-wing aircraft, UAVs and other flight-control applications. It combines an M10 GNSS positioning solution with a built-in QMC5883 electronic compass, providing both position and heading data in one lightweight module.

MAIN FEATURES

• M10 multi-GNSS positioning solution
• Built-in QMC5883 electronic compass
• Supports GPS, GLONASS, Galileo, BDS, QZSS and SBAS
• Up to 10Hz configurable navigation update rate
• NMEA 0183 and UBX output protocols
• UART interface for GPS data
• I2C interface for compass data
• 72 acquisition channels and 32 tracking channels
• Integrated ceramic antenna
• Fast satellite acquisition and reliable signal tracking
• Compact 25 × 25 mm design
• Compatible with F405, F722 and other supported flight controllers
• Suitable for FPV drones, fixed-wing aircraft and long-range UAVs

M10 MULTI-GNSS POSITIONING

The BZ-251 supports multiple satellite navigation systems, helping the module receive more available satellites and maintain reliable positioning in different operating environments.

Supported systems:

• GPS/QZSS: L1 C/A
• GLONASS: L1OF
• BDS: B1I
• Galileo: E1B/C
• SBAS: EGNOS, GAGAN, MSAS and WAAS

The available satellite combinations depend on the module configuration. BDS and GLONASS may not operate simultaneously in certain configurations.

BUILT-IN QMC5883 COMPASS

The integrated QMC5883 electronic compass provides heading information through the I2C interface.

Compass model: QMC5883
I2C address: 0x0C

The compass can be used for navigation, heading control, return-to-home and other supported flight functions. Flight-controller firmware must support the selected compass and be configured correctly.

FAST AND ACCURATE POSITIONING

• Horizontal positioning accuracy: 2.0 m CEP
• Speed accuracy: 0.05 m/s
• Cold start time: approximately 29 seconds
• Hot start time: approximately 1 second
• Maximum navigation update rate: up to 10Hz
• Tracking sensitivity: -166 dBm
• Reacquisition sensitivity: -160 dBm
• Cold-start sensitivity: -148 dBm

Actual positioning performance may vary according to satellite visibility, antenna orientation, installation position, weather, radio interference and flight-controller configuration.

DUAL OUTPUT PROTOCOL

The module supports two commonly used GNSS output protocols:

• NMEA 0183 v4.0/v4.1
• UBX binary protocol

Supported baud-rate range:

9600–460800 bps

The factory baud rate and update rate may vary according to the production batch or configuration. If the flight controller cannot detect the GPS automatically, please test common settings such as 38400 bps or 115200 bps and verify the selected protocol.

ELECTRICAL SPECIFICATIONS

Product model: BZ-251
GNSS solution: M10 Multi-GNSS
Compass: QMC5883
Supply-voltage range: DC 3.0–5.5V
Recommended supply: DC 5V
Digital I/O level: 3.3V TTL
Typical acquisition current: approximately 35 mA at 5V
Typical tracking current: approximately 32 mA at 5V
Maximum acquisition current: approximately 41 mA
Maximum tracking current: approximately 40 mA

Do not apply 5V directly to a 3.3V signal input unless the connected controller is designed to accept it.

INTERFACE AND PIN DEFINITION

Pin order:

1. TX – GPS UART data output

2. RX – GPS UART data input

3. GND – Ground

4. 5V/VCC – Main power supply

5. SCL – I2C compass clock

6. SDA – I2C compass data

WIRING GUIDE

GPS connection:

• Module TX → Flight-controller UART RX
• Module RX → Flight-controller UART TX
• Module 5V → Flight-controller 5V
• Module GND → Flight-controller GND

Compass connection:

• Module SCL → Flight-controller I2C SCL
• Module SDA → Flight-controller I2C SDA

TX and RX must be connected crosswise. SCL and SDA are required when using the built-in compass.

MECHANICAL SPECIFICATIONS

Module size: approximately 25 × 25 × 6.8 mm
Ceramic antenna size: approximately 25 × 25 × 4 mm
Product weight: approximately 11.9 g
Antenna type: passive ceramic antenna
Operating temperature: -40°C to +85°C
Maximum dynamic acceleration: 4G
Maximum supported speed: 500 m/s

INSTALLATION RECOMMENDATIONS

1. Install the module with the ceramic antenna facing upward toward the sky.

2. Position it away from the VTX, ESC, high-current power cables and other sources of electromagnetic interference.

3. Mount the module on a stable, level surface.

4. Keep the wiring short, secure and separated from motor or battery cables where possible.

5. Confirm correct voltage and pin order before applying power.

6. Perform compass calibration after installation if the compass function is enabled.

7. Test GPS reception outdoors with a clear view of the sky.

8. Wait for a stable satellite fix before takeoff.

COMPATIBILITY

Suitable for:

• F405 flight controllers
• F722 flight controllers
• Flight controllers with available UART and I2C interfaces
• FPV racing drones
• Long-range FPV drones
• Fixed-wing aircraft
• UAV positioning and navigation projects

It may be used with Betaflight, INAV, ArduPilot and other compatible firmware when the required GPS protocol, UART port and compass driver are supported. Compatibility depends on the flight-controller hardware and firmware version.

APPLICATIONS

• GPS positioning
• Flight-path navigation
• Return-to-home functions
• Lost-model rescue support
• Heading detection
• Position hold
• Fixed-wing navigation
• Long-range FPV flight

PACKAGE CONTENTS

The package quantity depends on the option selected:

• 1PCS option: 1 × BZ-251 GPS module
• 3PCS option: 3 × BZ-251 GPS modules
• 5PCS option: 5 × BZ-251 GPS modules

Only the selected quantity is included. Cables, flight controllers, drones and mounting accessories are not included unless they are specifically shown as included in the selected product option.

IMPORTANT NOTES

• Please check the model, quantity and interface requirements before ordering.
• Dimensions and weight may have small production or measurement tolerances.
• Product appearance, label code and PCB details may vary slightly between production batches without affecting the main function.
• GPS performance depends on the installation environment and satellite visibility.
• Professional installation and configuration are recommended.
• The module is not waterproof unless protected by the user’s installation.