Holybro DroneCAN M9N GPS

The Holybro DroneCAN M9N GPS pairs a u-blox NEO-M9N receiver with a BMM150 (or IST8310) compass on a single DroneCAN module, so ArduPilot and PX4 autopilots get GPS, compass and status LED over one 4-pin cable instead of separate GPS, I2C and LED runs.

Key features

• Tracks up to 4 GNSS constellations at once (GPS, GLONASS, Galileo, BeiDou) with SBAS augmentation, giving 2.5m horizontal accuracy and a 5Hz update rate (10Hz max).
• An STM32G4 processor runs the DroneCAN stack at 1Mbit/s, freeing a serial port on the flight controller and cutting interference compared with a UART-connected GPS.
• 25x25x4mm ceramic patch antenna with 22dB LNA gain, plus a rechargeable back-up capacitor for a faster warm start.
• GHR-04V-S CAN connector on a 27cm cable; newer batches add a software-toggle CAN termination resistor.

Specifications

• GNSS receiver: u-blox NEO-M9N
• Compass: BMM150 / IST8310
• Processor: STM32G4 (170MHz, 512K flash)
• Accuracy: 2.5 m
• Update rate: 5 Hz (10 Hz max)
• Interface: DroneCAN, GHR-04V-S connector
• Input voltage: 4.7-5.2 V
• Current draw: under 200 mA at 5 V
• Operating temperature: -40 to 80 °C
• Size: 54 mm diameter, 14.5 mm thick
• Weight: 36 g

It gives metre-level positioning rather than centimetre-level RTK — pick an RTK-capable module such as an F9P-based unit if survey-grade accuracy is the requirement.