Here is a program I wrote to display NMEA GPS data. It displays the GPZDA, GPRMC, GPGGA, GPGSV and GPGSA messages. The position of the sats in view is also plotted for the last 32 positions. This was just a quick project to help me learn NMEA protocol and understand some common messsages. GPL source code included.
nice job!
I will check it out 
Works great! Thanks for posting it. I just got my GPS kit and know very little about how to use it. Your files are going to make teaching myself all this stuff much easier. Again, thank you.