If there is a MATLAB or C script already, there is an easy way that you can try to use LabVIEW to call those implemented code and transfer data through, e.g., MATLAB script node and you just need to add an output element into your LabVIEW Program.

If your GPS module creates a virtual serial ports towards the PC, you can open the port and parse the data directly. In most cases GPS data is delivered by using the NMEA protocol. Information is encoded in readable text and delivered at 4800 bps. You can find the definition of the protocol on-line and then extract such information as location, time, which satellites are seen etc.