[RyanCahoon]

In line with efoote868's comments, the VEX Cortex has two TTL UART serial ports. You should be able to connect directly to any GPS chip that supports TTL serial communication. If you're using ROBOTC, you can use these functions to communicate via the UART ports. There is apparently support in EasyC since v4, but I can't find any documentation online about it. You would need to consult your GPS chip's documentation for the specific format of the commands to send and the data that will be sent back.