Once the G Star IV driver is correctly loaded, validate functionality:

Check the list for an older driver version (such as version 3.3.2.102 or any version from 2008–2014).

If your device was purchased new, a mini CD-ROM may have been included. This CD contains the USB driver which should work with Windows 11. If your computer lacks a CD drive, you'll need an external one to access the files.

While the BU-353S4 uses SiRF chips, u-center is often used for testing NMEA streams, but it can be finicky with SiRF. A better test tool is or VisualGPS .

Due to the transition of Windows architecture and the deprecation of legacy serial port handling, the BU-353S4—which uses a USB-to-Serial bridge—does not operate with generic Windows drivers. The critical finding of this report is that Windows 11 natively misidentifies the device. Users must override the default "USB Serial" driver with the specific to achieve functionality.

Download the (or the version provided by GlobalSat). Right-click the installer and select Run as Administrator .

If you see $GPGGA, $GPRMC sentences, your is working correctly on Windows 11.