Located in Shenzhen, China, Portman GPS develop and manufacture the web-based GPS/GPRS/SMS tracking and navigation systems for worldwide AVL, LBS services, fleet, workforce management. The various GPS tracking solutions covers vehicle tracking, personnel tracking, heavy equipment tracking, black box, vessel& boat tracking, motorcycle tracking, as well as asset tracking systems. With SiFR Star III GPS and Siemens / Sony Ericssion GPRS modules for system integration. The most advantage of Portman GPS is that we can custumize our desgin, software programs for worlwide unique requests. We offer worldwide GPS tracking platform for free hardware evaluations. For small fleet tracking solution, we designed the PC hosted GPS/GSM/SMS tracking solutions including tracking software lisence, with this, users only need to invest hundreds of dollars to build an independent tracking station. Besides, we also manufacture various GSM car alarms and other vehicle/ Home security solutions. More than 62 GPS engineers and 600 workers make us a leading one in this field since 1983.