Use GPS without GPS receiver! This is software GPS device emulator (virtual GPS receiver). It can be used for development purposes or for testing GPS software before buying. Generates NMEA messages from different data inputs (map or file). Generated NMEA sentences (RMC, GGA, GLL) to COM port or file can be used by mapping or other GPS enabled software . GPS emulator can be helpful not only for software developers, but also for users, who want to learn navigation software before buying GPS receiver.
This virtual GPS receiver can operate without GPS satellites visible and therefore it can be more effective than hardware GPS receiver indoor. Virtual COM port software (virtual null-modem) can be found on web site http://avangardo.com.
For example, you may emulate boat moving at 10 knots around the coast and its navigation device.