... , recommended for a fleet of 50 -200 vehicles/personnel. It works with ExtremTrac vehicle trackers, personal trackers, tracking vehicle and ... ET3500/MC300, etc trackers, and transmit to PC mapping software EX300. The software uses the RS232 serial port to communicate data via ... , MS MapPoint, Google Earth, Google Earth Plus, Trackmaker, etc. It allows the real time tracking of unlimited vehicles at the ...