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GPS BU-353 S4 Receiver

Low-cost high performance GPS set with a USB connection

BU-353 S4 - this GPS has been designed specificaly for laptops and PC's, its both compact and has outstanding performance for accuracy and sensitivity. Featuring a simple USB conection to the PC it offers fantastic value for money.

Windows , 7, 8.1 and 10

Earlier Windows versions (XP/Vista) depends on system as operating system are no longer suypported by Microsoft.


The USB connection of the BU-353 S4 means no addtional USB to serial converter, and no need for additional power connections as power comes direcly from the USB connection.

This new generation of GPS includes the latest SiRFstar IV technology for increased performance with 48 channel parallel acquisition. A technology that delivers improved satellite acquisition giving faster initial position and a built in high-sensitivity antenna for the best reception and tracking.

Please note:
The BU-353 S4 GPS does not have any user display (LCD) and must be used with a laptop and suitable software (seaPro).

If a GPS position is vital for safety, then a hand held GPS with its own display should also be carried in case of PC failure.

The BU-353 S4 maybe small, but it contains a high performance 48 channel GPS receiver that will work through glass, Perspex or plastic enabling it to be placed inside the cabin close to a window or hatch. Even with a restricted view of the sky, this high performance waterproof GPS continues to report accurate positional data.
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Key features
SiRF star III Chipset - 48 channel for high performance satellite reception
Small size - ideal for use with portable navigation systems
Direct USB connection to laptop or PC
Powered directly from the laptop or PC
Built in high-sensitivity antenna for the best reception. (-163dBm)
Compatible with both seaPro and seaPro lite
WASS / EGNOS enabled
Waterproof housing
Simple connection and setup
LED status display
Tech specification:


Sensitivity -163dBm type  

Position <15m CEP(95% horizontal, SA off (optimum conditions)
Velocity 0.1 meters/second
Time +-100ns synchronized to GPS time
Note: There is improved accuracy with WAAS/ENGOS availability

Datum WGS84  
Acquisition rate Hot start
Warm start
Cold start

1 sec average
35 sec average
35 sec average

Dynamic conditions


18,000 meters max
515meters/sec (1000kts) max
4g max
20 meters/sec/sec/sec max

Power 5 v +-0.5Vp-p DC input (fed from USB) at 55mA max

Serial port (virtual com port via USB driver)

at 4800 baud, 8 Bits, 1 stop, no parity
Standard interface USB 2.0 with virtual com port driver

Environmental Operating temperature
Storage temperature
Operating humidity

-40C to +80C
-45 to +85C
5% to 90% non-condensing

Physical Dimensions approx (mm) 56 x 53 x 19 (2.20" x 2.08" x 0.88")
Weight 62.37gms (2.2 oz)

Note: Specification may alter without notice, and presume best conditions for reception etc.