SYNOTrak? SX-900 GPS Personal & Asset Tracking System. Low-cost GPS tracking hardware for Vehicle Location, Gps Personal Tracking and GPS Asset Tracking Systems. Highly reliable Siemens Tri-band MC55/56 GSM + GPRS and SiRF III GPS Chipset. Small form factor and easy to integrate design makes the SYNOTrak? SX-900 perfect for any GPS vehicle, people or asset tracking system application.