BZGNSS GPS Module BZ-121/181/251 Dual Protocol M10 Chip for FPV drone

professional dual-protocol gps positioning module with u-blox m10 chip for fpv drones

the bzgnss gps module series (bz-121, bz-181, bz-251) features the advanced u-blox m10 tenth-generation chip with dual-protocol support (nmea/ublox), multi-constellation positioning (gps, glonass, bds, galileo, sbas, qzss), and ceramic antenna for reliable satellite reception. perfect for fpv drones, fixed-wing aircraft, and rc planes requiring failsafe return-to-home (rth), position hold, and precision navigation capabilities.

key features

• u-blox m10 chip – tenth-generation gps technology
• dual protocol support – nmea and ublox protocols
• multi-constellation – gps, glonass, bds, galileo, sbas, qzss
• 72 search channels – fast satellite acquisition
• ceramic antenna – oil-spray coated for durability
• high accuracy – 1.5m horizontal positioning (open air)
• 10hz update rate – smooth position tracking
• compact sizes – 12mm to 25mm options
• wide temperature range – -40°c to +85°c operation
• compass option – qmc5883 on bz-251

perfect for

• fpv racing and freestyle drones
• fixed-wing rc aircraft
• long-range fpv missions
• return-to-home (rth) functionality
• position hold and gps rescue
• autonomous flight modes

model comparison

bz-121 (ultra-compact)

• size: 12×16×4.5mm
• weight: 2.2g
• chip: u-blox m10050
• baud rate: 115200 bps
• protocol: nmea/ublox (dual)
• update rate: 1-10hz (default 10hz)
• compass: no
• best for: ultra-lightweight builds, racing quads

bz-181 (compact)

• size: 18×18×8mm
• weight: ~5g
• chip: u-blox m10
• baud rate: 9600 bps
• protocol: ublox
• update rate: 1-10hz (default 1hz)
• compass: no
• best for: compact builds, freestyle drones

bz-251 (standard with compass)

• size: 25×25×8mm
• weight: ~8g
• chip: u-blox m10
• baud rate: 115200 bps
• protocol: nmea/ublox (dual)
• update rate: 1-10hz (default 10hz)
• compass: yes (qmc5883)
• best for: full-featured builds, fixed-wing, autonomous flight

technical specifications

common specifications (all models)

• chip family: u-blox m10 (tenth generation)
• constellations: gps l1, glonass l1, bds b1, galileo e1, sbas l1, qzss l1
• power: 5v
• receiving channels: 72 search channels
• antenna: ceramic antenna with oil-spray coating
• speed accuracy: 0.05 m/s
• horizontal positioning accuracy: 2d acc 1.5m (open air)
• receiving sensitivity: trace -162dbm, capture -160dbm
• operating temperature: -40°c to +85°c
• storage temperature: -40°c to +105°c

dynamic characteristics

• max altitude: 50,000m
• max speed: 500 m/s
• max acceleration: 4g

advanced features

u-blox m10 tenth-generation chip

the latest u-blox m10 chip delivers superior performance with faster satellite acquisition, improved accuracy, lower power consumption, and enhanced interference rejection compared to previous generations, ensuring reliable positioning even in challenging rf environments.

multi-constellation support

simultaneous tracking of gps, glonass, bds (beidou), galileo, sbas, and qzss satellites with 72 search channels provides faster lock times, improved accuracy, and better reliability in urban canyons or areas with limited sky visibility.

dual protocol support

bz-121 and bz-251 support both nmea and ublox protocols, providing compatibility with a wide range of flight controllers including betaflight, inav, ardupilot, and px4, while bz-181 uses ublox protocol for streamlined integration.

high update rate

configurable update rates from 1hz to 10hz (default 10hz on bz-121/251, 1hz on bz-181) provide smooth position tracking for responsive gps rescue, accurate position hold, and precise autonomous navigation.

ceramic antenna with oil-spray coating

high-quality ceramic antenna with protective oil-spray coating prevents scratching and oxidation while delivering excellent satellite reception performance across all supported frequency bands.

integrated compass (bz-251)

the bz-251 includes a qmc5883 compass for heading information, enabling advanced features like heading hold, return-to-home with proper orientation, and improved autonomous flight capabilities.

what’s included

• 1× bzgnss gps module (bz-121, bz-181, or bz-251 depending on selection)
• mounting hardware (varies by model)

what you’ll need

• compatible flight controller (betaflight, inav, ardupilot, px4, etc.)
• appropriate cable/connector for your fc
• mounting location with clear sky view
• 5v power supply from flight controller

flight controller compatibility

• betaflight: gps rescue mode, position hold
• inav: full autonomous navigation, waypoints, rth
• ardupilot: advanced autonomous missions
• px4: professional autonomous flight
• other: any fc supporting nmea or ublox gps protocols

applications

• fpv racing: gps rescue for out-of-range recovery
• fpv freestyle: return-to-home safety feature
• long-range fpv: precision navigation and rth
• fixed-wing: autonomous flight, waypoint navigation
• rc planes: position hold, failsafe rth
• autonomous missions: waypoint flying, survey missions

installation tips

• mount with clear view of sky (top of aircraft)
• keep away from high-power rf transmitters (vtx, control link)
• ensure antenna faces upward for best reception
• use shielded cable if running near escs or motors
• configure correct baud rate in flight controller
• allow 1-2 minutes for initial satellite lock

important notes

• three models available: bz-121 (12×16mm), bz-181 (18×18mm), bz-251 (25×25mm)
• u-blox m10 tenth-generation gps chip
• multi-constellation: gps, glonass, bds, galileo, sbas, qzss
• 72 search channels for fast satellite acquisition
• dual protocol support: nmea/ublox (bz-121, bz-251), ublox only (bz-181)
• update rate: 1-10hz configurable
• horizontal accuracy: 1.5m (open air)
• speed accuracy: 0.05 m/s
• ceramic antenna with oil-spray coating
• compass: qmc5883 (bz-251 only)
• power: 5v
• operating temperature: -40°c to +85°c
• max altitude: 50,000m
• max speed: 500 m/s
• max acceleration: 4g
• weight: 2.2g (bz-121) to ~8g (bz-251)
• compatible with betaflight, inav, ardupilot, px4
• enables gps rescue, rth, position hold, autonomous flight
• recommended for ages 14+
• flight controller and cables not included