Virtual GPS is a GPS simulator software. You can use it to simulate a GPS receiver unit connected to your system. It's ideal when you need GPS input, but you have no signal or for development purposes. It supports various NMEA sentences, so it can be used with any GPS mapping software.
You can use it using a null-modem cable connected to two physical serial ports or you can use one of the virtual serial port software from the market.

• Virtual Serial Port Driver Mobile 4.0
  VSPD Mobilel can create up to 20 pure virtual serial ports in your mobile system, resulting in 10 virtual serial ports pairs available for integration

• Virtual Serial Ports Driver CE 3.2
  Virtual Serial Ports Driver for Windows CE creates two pure virtual serial ports in your system which are virtually connected to each other

• Virtual Serial Ports Driver 5.1.3
  Virtual Serial Port Driver by Virtual Serial Port Software, department of Eltima, emulates two virtual serial ports with real serial port functionality, including baud rate, data bits, and allows connecting two applications via virtual serial ports

• Virtual Serial Port Driver XP4 4.
  Using Virtual Serial Port Driver XP4 you can create virtual serial COM port pairs which are virtually connected to each other via virtual null-modem cable and for other Windows applications seen as real serial ports connected via null-modem cable

• Virtual Serial Ports Driver XP 4.
  Using Virtual Serial Ports Driver XP you can create any number of virtual serial ports in your system which will be connected to each other via virtual null-modem cable

• Virtual Serial Port Driver XP4 4.0
  Using Virtual Serial Port Driver XP4 you can create virtual serial COM port pairs which are virtually connected to each other via virtual null-modem cable and for other Windows applications seen as real serial ports connected via null-modem cable