Overview
The Beitian BK-609U is a USB interface GNSS mouse receiver designed to output positioning data to compatible equipment via a USB serial interface. It supports multi-constellation positioning (GPS/BeiDou/GLONASS/Galileo) and provides NMEA-0183 data output for applications such as car/boat navigation, industrial positioning, survey tasks, and GIS mapping. The product is listed as compatible with BU-353S4.
Key Features
- Multi-constellation GNSS receiving format: GPS, GLONASS, BDS, GALILEO; auxiliary systems: SBAS, QZSS
- USB 2.0 male connector, USB-level output (PL2303SA chip TTL to USB driver stated)
- Output protocols: NMEA-0183; supported data protocol listed as NMEA and UBX
- Update rate: 0.25Hz–25Hz (default 1Hz)
- Built-in FLASH (configuration can be changed; power loss will not lose configuration)
- Magnetic bottom for mounting
- LED status indicators (TX/data and PPS indicators are specified for this series)
Specifications (BK-609U)
| Chipset | M9140-KB |
| Frequency bands / systems | GPS L1 C/A; QZSS L1 C/A/S; GLONASS L1OF; BDS B1I; Galileo E1B/C; SBAS L1 C/A (WAAS, EGNOS, MSAS, GAGAN) |
| Receiving format | GPS, GLONASS, BDS, GALILEO |
| Auxiliary system | SBAS, QZSS |
| Channels | 92 searching channel |
| Sensitivity (tracking) | -167 dBm |
| Sensitivity (reacquisition / recapture) | -160 dBm |
| Sensitivity (cold start) | -148 dBm |
| Sensitivity (hot/warm start) | -159 dBm |
| Position horizontal | 1.5 m CEP |
| Velocity accuracy | 0.05 m/s |
| Dynamic heading accuracy | 0.3 deg |
| 1PPS time accuracy | RMS 30 ns; 99% 60 ns |
| Acquisition time (cold start) | 24 s |
| Acquisition time (warm start) | 2 s |
| Acquisition time (hot start) | 2 s |
| Assisted start | 2 s |
| Baud rate | 4800 bps – 921600 bps (default 115200 bps) |
| Output level | USB level |
| Output protocol | NMEA-0183 |
| Data protocol (listed) | NMEA, UBX |
| NMEA messages (listed) | RMC, VTG, GGA, GSA, GSV, GLL |
| Update rate | 0.25Hz–25Hz (default 1Hz) |
| Second pulse | 0.25 Hz to 10 MHz configurable; default period 1 s; high level lasts for 100 ms |
| Operational limits (altitude) | 80,000 m |
| Operational limits (velocity) | 500 m/s |
| Operational limits (acceleration) | <= 4 g |
| Supply voltage (VCC) | DC 3.6 V–5.5 V (typical 5.0 V) |
| Current | 45 mA / 5.0 V |
| Dimensions | Phi 63.2 x 16.8 mm (structural diagram: Phi 63.20 +/- 0.3; 16.8 +/- 0.3) |
| Weight | 95 g |
| Connector | USB 2.0 male |
| Cable length | 2 m (structural diagram: 2000 +/- 20) |
| Mounting | Magnetic bottom |
| Operating temperature | -40 C to +85 C |
| Storage temperature | -40 C to +105 C |
| LED (TX) | Blue light flashes when the power is on, indicating there is a data output |
| LED (PPS) | Not positioned: the light is not on; after 3D positioning, the light flashes |
USB Pin Description
| Pin 1 | VCC | DC 3.6 V–5.5 V supply input, typical: 5.0 V |
| Pin 2 | D- | USB D- |
| Pin 3 | D+ | USB D+ |
| Pin 4 | GND | Ground |
What's Included
- GNSS receiver (1 pc)
- Box (1 pc)
Applications
- Car navigation
- Nautical positioning (boat)
- Logistics tracking
- Industrial positioning, survey, and GIS mapping
Options
Available model options may include: BV-609N, BV-609D, BV-606U, BV-609DN, BV-609DU, BE-609N, BE-609D, BE-609U, BE-609DN, BE-609DU, BU-609N, BU-609D, BU-609U, BU-609DN, BU-609DU, BK-609N, BK-609D, BK-609U, BK-609DN, BK-609DU.
Support
For selection guidance (interfaces, protocols) or project integration support, contact customer service at https://rcdrone.top/ or support@rcdrone.top.
Details

Compare interface options and core specifications across Beitian GNSS mouse receiver variants to choose the right USB model for your setup.

If you’re matching an existing installation, the side-by-side list helps verify connector type, cable style, and output details before ordering.

Configuration support and development files help teams integrate NMEA/serial output into GIS, navigation, and tracking workflows.

Multi-constellation GNSS support (GPS/BeiDou/GLONASS/Galileo) improves positioning availability for vehicle and marine navigation.

Signal charts and sky maps illustrate satellite tracking performance and acquisition behavior in typical operating conditions.

A quick overview of how satellite data is received and output to equipment, plus a chipset generation comparison for reference.

Standard NMEA message types are supported for time, location, satellites, and speed—while the LEDs provide clear power and fix feedback.

Test summaries outline sensitivity, positioning accuracy, time-to-fix, and power consumption for performance evaluation.

Dimensions and a detailed spec table make it easier to confirm fit and electrical/output requirements for dashboards, boats, or field kits.

Pin definitions and mechanical drawings support system integration, with common use cases including logistics tracking and vehicle navigation.

The package includes the BK-609U USB GNSS mouse receiver and retail box for straightforward plug-and-play setup.
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