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Globalsat Bu-353-S4 Usb Gps Receiver (Black) (Improved-New)The BU-353-S4 is a USB gPS receiver that features a highly sensitive, low power consumption chipset in a ultra compact form factor The BU-353-S4 is powered by a SiRF Star IV gPS chipset, and will provide you with superior performance in urban canyons, and in dense foliage With the SiRF cgEE..