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Manual
| Specification | Details |
| Brand | BZGNSS |
| Model | BZ-251 |
| Type | GPS Module with Compass |
| GPS Receiver Type | GPS, GLONASS, Galileo, QZSS, SBAS |
| Frequency | L1 band (1575.42 MHz) |
| Channels | 72-channel |
| Positioning Accuracy | Horizontal: <2.5m CEP |
| Velocity Accuracy | <0.1 m/s |
| Timing Accuracy | ±30 ns |
| Acquisition Time | Cold Start: <30 s |
| Warm Start: <5 s | |
| Hot Start: <1 s | |
| Sensitivity | Tracking: -167 dBm |
| Cold Start: -148 dBm | |
| Hot Start: -156 dBm | |
| Update Rate | Up to 10 Hz |
| Power Supply Voltage | 3.3V to 5V |
| Power Consumption | <30 mA (continuous tracking mode) |
| Interfaces | UART, I2C, SPI |
| Baud Rate | Configurable, default 9600 bps |
| Antenna | Integrated ceramic patch antenna, 25x25mm |
| Compass | HMC5883L 3-axis magnetometer |
| Compass Resolution | 12-bit ADC, 0.73 mG/LSB |
| Compass Range | ±8 gauss |
| Compass Accuracy | ±1° to ±2° |
| Compass Interface | I2C |
| Compass Data Rate | Up to 160 Hz |
| Dimensions | 25mm x 25mm x 8mm |
| Weight | 15g |
| Operating Temperature | -40°C to +85°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 5% to 95% non-condensing |
| Mounting Type | Surface mount (SMT) |
| LED Indicator | Power and status LEDs |
| Certifications | CE, FCC, RoHS |
| Firmware Upgrades | Supported via UART interface |
| Additional Features | - Built-in LNA and SAW filter |
| - Multi-path mitigation | |
| - Support for A-GPS | |
| - Support for DGPS and RTK modes | |
| - Combined GPS and compass for enhanced navigation |
