Interfacing the GPS Data Logger to the Mega board

Hello, I am having great difficulty getting the Arduino Mega to recognise the GPS data from an Arduino GPS Data Logger Shield card. The programs seem to upload to the Mega but all I recieve in the "Serial Monitor" section are Parse code and Data but no GPS strings.

I am not using the FTDI cable but am trying to monitor the system through the USB cable that I download the programs with. Can this be done or am I in error? My computer will also only let me use Com Port #4 for the serial data so that may also be a problem.

If anyone has been successful in getting one of these shields to work on the Mega card I would be interested in hearing how they did it . Thanks, Skip F