How to interface Arduino Uno and Trimble Copernicus 2?

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I hooked up the GPS data pin to D0 on the Uno and ran the code under that tutorial:

/*
  Example 17.1
  Display any data coming out of the GPS receiver in the serial monitor box
  tronixstuff.com/tutorials > Chapter 17
*/

// as the GPS module sends data out serially, we just pick it up character by
// character and repeat it to the serial output

byte aa;	
void setup() 
{
  Serial.begin(4800);	// the module runs at 4800 bps, not 9600!
}

void loop() 
{
  if (Serial.available()>0) // if there is data coming into the serial line
  {
    aa = Serial.read(); // get the byte of data
    Serial.print( byte(aa) ); // send it to the serial monitor
  }
}

Off the bat, nothing happened, but I will continue to investigate!

EDIT:
The original code actually said "Serial.print(aa, BYTE); // send it to the serial monitor", but that brings up the error "The 'BYTE' keyword is no longer supported.". I looked for a quick fix online and came up with switching it to "Serial.print( byte(aa));". That might be a problem if what I did does not function the same way as the original code would have. It compiled and uploaded without a problem though.