NMEA GPS to on Uno to MegaHe

Hello,

I have a GPS connected to an arduino uno, It currently logs it current locations every 1.5 seconds on to an SD card. The GPS unit from the ladyada website

I wanted to know how would I send the NMEA GPS Data to the Arduino Mega, to be used for navigation, from the uno while still logging on the uno.

I know I have to use I2C but Im not sure as to how I would go about doing this. I managed to make i2c work by sending a signal to turn on the led on the other board.

Why not just connect the GPS output over to the Mega, too? I'm pretty sure that the GPS output should be able to feed both the Uno and the Mega.