Virtual GPS is a GPS simulator software. You can use it to simulate a GPS
receiver unit connected to your computer. It's ideal when you need GPS
input, but you have no signal or you can use it to test your GPS
applications. It supports various NMEA 0183 sentences, so it can be used
with any GPS mapping software. It operates in two modes: simulator mode
and file mode. In simulator mode the latitude and longitude coordinates
are periodically incremented with a defined step. In file mode the GPS
data is loaded from a text file which contains NMEA 0183 sentences.