Right-click the Windows Start button and select . Expand the Ports (COM & LPT) section.
| Specification | Detail | | :--- | :--- | | | SiRF Star IV high-performance GPS chipset | | Frequency | L1, 1575.42MHz C/A Code | | Channels | 48 parallel channels tracking | | Sensitivity | Tracking: -163 dBm | | Position Accuracy | < 10 meters, 2D RMS (5 meters, 2D RMS with WAAS) | | Protocol | NMEA 0183 (GGA, GSA, GSV, RMC, VTG, GLL) | | Baud Rate | 4800 bps | | Power Consumption | 80mA | | Operating Temp. | -40°C to +85°C |
units often require a specific legacy driver version (v3.3.2.105 from 2008) to function correctly due to chip compatibility issues with newer Prolific drivers. Download the Driver : Visit the official GlobalSat BU-353S4 Product Page
Do not use the standard Windows Update driver. Follow these steps to get the working version: G Star Iv Gps Driver Download Bu-353s4 Windows 11
You should see "Prolific USB-to-Serial Comm Port (COMx)" listed.
Use a free GPS utility like , Visual GPS , or HyperTerminal (or PuTTY) to verify NMEA data output:
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GPS receivers are serial devices. They do not appear as a "GPS" in Windows. They appear as a virtual COM port. Your navigation software (OpenCPN, Google Earth Pro, Delorme Street Atlas) must open that COM port and read the data stream.
Before downloading any driver, it is critical to understand what you are working with.
To avoid malware, always source your drivers either directly from the manufacturer or trusted hardware repositories. | -40°C to +85°C | units often require
Look at the list of installed drivers. Select (dated 2008 or 2009) or Version 3.4.62.293 . Do not select the newest 2021+ version.
For the smoothest experience, it is highly recommended to download the driver directly from reputable sources that maintain legacy hardware support.
If the automated installer does not work, use these steps to manually update through Device Manager: Extract the Files: Unzip the downloaded driver package to a known folder. Open Device Manager: Right-click the button and select Device Manager Locate Device: Find the device under Ports (COM & LPT)
After installation, go back to Device Manager. Under "Ports (COM & LPT)", you should now see "Prolific USB-to-Serial Comm Port (COMx)" without any warning icons. The "x" will be the COM port number assigned to your GPS receiver.
: A solid red light means the device has power but no GPS fix. A blinking red light indicates a successful GPS fix.