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Intelligent Transportation Systems (ITS) require reliable location information with emphasis being put on sensor level integration and low power consumption. The Global Positioning System (GPS) has been proposed as a potential technology to provide this information but has been hampered by poor performance (in urban environments) and power hungry board level solutions. Increased pressure on in-vehicle sensor power consumption has driven SiRF Technology Inc. to develop the SiRFstar1/LX GPS chip set (GSP1LX and GRF1LX). This improved chip set architecture enables lower power consumption without sacrificing tracking or navigation performance specifically in difficult urban canyons. Most GPS systems have been designed as stand-alone board level solutions that can be used in high-level system integration.