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ZylGpsReceiver.NET is an event driven .NET library that communicates with a GPS receiver. It returns latitude, longitude, altitude, speed, heading and many other useful parameters of the current position and the parameters of the satellites in view. The component is extended to calculate distances and make conversions between different measurement units. This component works with any NMEA compatible receiver connected to one of the serial ports. You can use it also with USB devices, because these devices usually have a driver that redirects the input from the USB port to a virtual serial port (you can check it in Device Manager/Ports). If your device is not provided with such a driver, then use a USB controller whose vendor provides a virtual serial port driver, such as FTDI or use a USB/RS-232 adapter. ZylGpsReceiver.NET is written 100% in C#, using .Net framework and Windows API.