SD-501 SD GPS GPS receiver with SDIO interface. Compact and stylish design! SD-502 SDIO GPS SiRF StarIII chipset built-in memory, and portable GPS Receiver! BC-307 Compact Flash GPS Receiver BC-337 Compact Flash GPS Receiver SiRF Star III chipset with dimension of (83 mm x 42.8 mm x 13.3 mm), it is an Ultra Compact Design and small enough to fit in your pocket, the GPS-CF is perfect from everyday route planning to cross-country road trips.