Virtual GPS, the useful GPS simulator application can simulate a GPS receiver unit attached with your system.
This exclusive GPS simulator application is capable of simulating a GPS receiver unit attached with your system when there is not much apt signals. It is also capable of facilitating several NMEA sentences that makes it usable with any of the GPS mapping applications. The program functions as a null-modem cable that is connected with 2 physical serial ports. This program supports features like: it is fully functional in the simulator and file modes, it comprises four tabs - Simulator, Settings, Satellites, and WayPoints; can be used with any GPS mapping software, the Settings tab allows to define Start Latitude, Start Longitude, Navigational Parameters, Magnetic Parameters, Dilution of precision, Latitude Steps, Longitude Steps, and much more.
The simple tool can be used with a null-modem cable connected to two physical serial ports or you can use one of the virtual serial port software.