1)   MarshallSoft GPS Component for C/C++ 2.0
GPS component C/C++ (.NET) library toolkit reads and decodes standard GPS NMEA 183 sentences from the RS232 serial port; computes great circle distances and bearings. Runs as a background thread unattended. Works with C++,VC.NET,C#,MFC,C++ Builder.

 2)   MarshallSoft GPS Component for Visual Basic 1.4
GPS component VB library toolkit reads and decodes standard GPS NMEA 183 sentences from the RS232 serial port, as well as computes great circle distances and bearings. Runs as a background thread unattended. Works with Visual Basic and VB.NET.