92-channel u-blox M9 engine tracks GPS, GLONASS, Galileo and BeiDou concurrently
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Gps Gnss
u-blox NEO-M9N GPS Breakout (SMA)
The u-blox NEO-M9N GPS breakout with SMA connector is a high-quality, four-constellation GNSS board built around the 92-channel u-blox M9 positioning engine.
₹2,499 + 18% GST
SKU: BOTBIT-GPS-04 · Best for: Drone and UAV navigation with external antenna
Overview
About u-blox NEO-M9N GPS Breakout (SMA).
The u-blox NEO-M9N GPS breakout with SMA connector is a high-quality, four-constellation GNSS board built around the 92-channel u-blox M9 positioning engine. Unlike older modules, the M9N concurrently tracks GPS, GLONASS, Galileo and BeiDou for fast, robust ~1.5 m accuracy, and the SMA edition lets you fit any external active antenna of your choice for fixed installations, vehicles or enclosures. The breakout exposes both a Qwiic I2C connector and standard 0.1-inch UART pins, so it drops into breadboard prototypes and embedded designs alike.
The board carries a rechargeable backup battery that powers the receiver's RTC, cutting time-to-first-fix from about 24 seconds cold to roughly 2 seconds hot. It speaks NMEA, UBX and RTCM over UART or I2C, supports a 25 Hz update rate with four concurrent constellations, and tolerates extreme dynamics with a maximum altitude of 80,000 m and 500 m/s velocity rating. Velocity accuracy is about 0.05 m/s and heading accuracy about 0.3 degrees.
It is aimed at engineers and advanced makers building drones, high-altitude balloons, rovers, RTK-input front ends and precise telemetry systems who want modern multi-band reception, a configurable u-blox engine, and the flexibility of a panel-mount SMA antenna rather than a fixed on-board patch.
Key features
Why it stands out.
SMA connector accepts any external active antenna for flexible, fixed installs
Both Qwiic I2C and 0.1-inch UART pins for breadboard and embedded use
Rechargeable backup battery cuts hot-start fix time to about 2 seconds
Handles extreme dynamics: 80,000 m altitude and 500 m/s velocity rating
Specifications
Selection facts.
| Receiver | u-blox NEO-M9N (u-blox M9 engine) |
|---|---|
| GNSS | GPS, GLONASS, Galileo, BeiDou (4 concurrent) |
| Channels | 92 |
| Max update rate | 25 Hz |
| Horizontal accuracy | ~1.5 m |
| Time-to-first-fix | Cold 24 s / Hot 2 s |
| Velocity accuracy | 0.05 m/s |
| Heading accuracy | 0.3 degrees |
| Max altitude / velocity | 80,000 m / 500 m/s |
| Interface / connector | UART, I2C (Qwiic); SMA antenna; 3.3 V |
Applications
Where it is used.
- Drone and UAV navigation with external antenna
- High-altitude balloon and rocketry telemetry
- Autonomous rover and robotics positioning
- Fixed base/reference and RTCM front-end input
- Precision asset and vehicle tracking
- Embedded GNSS designs with Qwiic/I2C SBCs
Buying guide
How to choose.
Choose the NEO-M9N SMA breakout when you need modern four-constellation tracking and the freedom to select your own antenna. The SMA connector is ideal when the antenna must be panel-mounted, relocated away from the board, or matched to a specific gain/mounting requirement, which is common in enclosures, vehicles and ground stations.
The dual interface is a key convenience: Qwiic I2C keeps your UART ports free for other peripherals, while the 0.1-inch headers suit breadboards and soldered designs. The on-board rechargeable battery is what enables the fast ~2 s hot start, so keep the board powered occasionally to retain the warm-start benefit.
If you want an all-in-one drone GPS with integrated compass and a ready-made cable for Pixhawk, a Holybro or CUAV M9N module may be a better fit. Pick this SparkFun-style breakout when you are doing custom integration, need an external SMA antenna, or want direct u-center configurability for a bespoke design.
FAQ
Common questions.
Why choose the SMA version over a U.FL or patch module?
The SMA connector lets you attach a robust external active antenna and panel-mount it away from the board, which is ideal for enclosures, vehicles and ground stations. U.FL is smaller for compact builds, while a fixed patch limits placement. SMA maximizes antenna flexibility and ruggedness.
How many constellations can it track at once?
The 92-channel u-blox M9 engine concurrently tracks all four major systems: GPS, GLONASS, Galileo and BeiDou. Four-constellation reception greatly improves fix speed, accuracy and reliability versus older single- or triple-constellation receivers, especially in obstructed environments.
What accuracy and update rate does it offer?
It delivers around 1.5 m horizontal accuracy with a maximum update rate of 25 Hz across four concurrent constellations. Velocity accuracy is about 0.05 m/s and heading accuracy about 0.3 degrees, suitable for demanding navigation and telemetry tasks.
Does it support RTK?
The NEO-M9N is a high-precision standard-accuracy receiver and can output RTCM/UBX data, but it is not a full RTK receiver. It is excellent as a robust ~1.5 m navigation source; for centimetre-level RTK you would use an RTK-capable receiver such as the u-blox F9P family.
What is the backup battery for?
The rechargeable battery powers the receiver's real-time clock and stores ephemeris data, so the module can perform a hot start in about 2 seconds instead of a roughly 24 second cold start. Periodic power keeps the battery charged and the warm-start benefit available.
Can I use it on an I2C single-board computer?
Yes. The Qwiic connector provides I2C (u-blox calls it DDC), which is handy for Raspberry Pi, ESP32 and similar SBCs because it frees up UART ports. You can also use the standard UART pins. NMEA, UBX and RTCM are supported on both interfaces.
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