Data submitted via APRS lets emergency personnel map changing weather conditions in real-time, and also helps the National Weather Service develop improved weather prediction models. Data logger simultaneously logs and stores the data, which can later be downloaded to your PC for all the graphing, charting, and analysis inlcuded with our standard WeatherLink. To track multiple stations on the same computer, add one WeatherLink for each station. To view the same weather station on multiple computers, add one #06510X Extra User License for each computer. System Requirements Requires Windows XP and above with an available serial port; Windows 2000/XP/Vista with an available serial port. Includes streaming data logger, software on CD, and an 8' (2.4m) cable to connect the data logger to your computer or modem. Not for use with WeatherLink for Mac.