TeleCommunication Systems, Inc. (TCS) - Supplies messaging and location technology to wireless carriers, including software and services. TruePosition - U-TDOA technology for E-911 and other location-based services. Company offers core location technology, design, installation, and integration services. AeroScout - Provides active RFID location tracking solutions that utilize a standard Wi-Fi infrastructure. Spirent Communications - Provides positioning technology for location solutions including GPS, SBAS, GLONASS and wireless products. Satellite Tracking of People LLC - Provider of global positioning satellite tracking systems. Purelink Technology - Provides real-time location system using active RFID. Track 24 - Provides products and services includes crisis management and risk management software, satellite phone tracking. USA. Mobileye - Manufacturers of collision warning systems and vehicle tracking systems for both fleets and private vehicles. Netherlands. Navizon - Positioning system that works by triangulating signals from surrounding cellular towers and Wi-Fi access points. It is based on a community of users mapping the wireless landscape around the world. Spirent Federal Systems - Specializes in GPS and GNSS test and simulation technology for the U.S. Government, prime contractors, and commercial sector. USA. Atlantic Source - Provides worldwide tracking services for ships, trucks and all types of vehicles. Technologies used included Inmarsat D+ and GSM/GPRS. Services are offered via Web.