Overview
The Beitian BS-57DU is a Marine GNSS Receiver with an integrated ceramic patch antenna (mushroom-head style), designed for marine/shipborne navigation applications such as AIS navigation. It uses the G7020-KT chip and supports GPS L1 / SBAS L1 / QZSS L1, with NMEA-0183 output.
Key Features
- Chipset: G7020-KT
- Supported frequency/mode: GPS L1, SBAS L1, QZSS L1
- Sensitivity: Tracking -162 dBm; Reacquisition -160 dBm; Cold start -148 dBm
- Accuracy labels: Horizontal accuracy 2.0 m CEP; Speed accuracy 0.1 m/s CEP; Time accuracy 1 us
- Update rate: 1 Hz to 10 Hz (default 1 Hz)
- NMEA-0183 output protocol
- Start times (typical): Cold start 29 s; Warm start 25 s; Hot start 1 s
- FLASH: labeled with “4M FLASH”; configuration can be changed and is retained when power is off
- Cable note: labeled as using high-quality soft copper wire
Specifications
Common GNSS performance (all listed BS-57 series variants)
| Chip | G7020-KT |
| Working mode | GPS L1, SBAS L1, QZSS L1 |
| Sensitivity (Tracking) | -162 dBm |
| Sensitivity (Reacquisition) | -160 dBm |
| Sensitivity (Cold start) | -148 dBm |
| Horizontal | 2.0 m (Typical Open Sky) |
| Velocity | 0.1 m/sec 95% (SA off) |
| Dynamic heading | 1 us synchronized to GPS time |
| Cold boot | 29 s |
| Warm boot | 25 s |
| Hot Start | 1 s |
| Output protocol | NMEA-0183 |
| Frequency of updates | 1 Hz-10 Hz, Default 1 Hz |
| FLASH | with FLASH (also labeled “4M FLASH”) |
| Operational limits | Altitude < 50,000 m; Velocity < 515 m/s; Acceleration < 4 g |
| Voltage | DC 3.6 V-5.5 V, Typical: 5.0 V |
| Current | Capture 45 mA/5.0 V |
| Size | 95*95*125 mm |
| Operating temperature | -40°C ~ +85°C |
| Storage temperature | -40°C ~ +85°C |
Interface / output by model (as labeled)
| Model | Output level | Baud rate (bps) | Connector | Cable length | Weight | Fixed |
|---|---|---|---|---|---|---|
| BS-57U | USB level | 4800 bps to 921600 bps, Auto-adapted baud rate | USB 2.0 interface | 2 m | 450 g | DIY |
| BS-57D | RS-232 level | 4800 bps to 921600 bps, Default 9600 bps | DB-9 female interface | 3 m | 260 g | DIY |
| BS-57DN | RS-232 level | 4800 bps to 921600 bps, Default 9600 bps | DB-9 Female + Power Cable | 3 m | 280 g | DIY |
| BS-57DU | RS-232 level | 4800 bps to 921600 bps, Default 9600 bps | DB-9 Female + USB 2.0 Male | 3 m | 280 g | DIY |
| BS-57N | RS-232 level | 4800 bps to 921600 bps, Default 9600 bps | 4 Cable: Red VCC, Green RX, White TX, Black GND | 3 m | 250 g | DIY |
What's Included
- GNSS receiver antenna (BS-57 series)
- Pedestal/base (mounting component, as labeled in the product list graphic)
Applications
- Ocean ship / marine ship navigation
- Vehicle navigation
- Agricultural machinery
- Marine ship timekeeping
For interface selection (USB, DB-9/RS-232, or 4-wire) and integration support, contact https://rcdrone.top/ or email support@rcdrone.top.
Details

Choose the BS-57 interface option that fits your installation (USB, RS‑232/DB‑9, or 4‑wire), with configurable settings.

Mushroom-head housing with an integrated ceramic patch antenna for marine and vehicle GNSS positioning.

G7020‑KT chipset support for GPS L1 / SBAS L1 / QZSS L1 with NMEA‑0183 output for navigation and AIS setups.

Configuration changes can be saved to onboard FLASH, with typical cold/warm/hot start times listed for reference.

NMEA‑0183 data output over RS‑232 with adjustable baud rate and 1–10 Hz update frequency.

Marine navigation, vehicle positioning, and timekeeping applications plus key parameters in one quick reference.
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