GPS Sensor not responding!

Hey guys. I'm building a reverse geocaching box like the one found here

Finally got the LCD and software working correctly. Now the GPS isn't working. The light on it is EXTREMELY dim. It doesn't seem to do anything. Any thoughts?

It's an EM406A GPS Sensor

Try dropping the Arduino Tx signal across a resistor divider. The EM-406 uses 2.8 volt logic while the Arduino uses 5 volt. A couple of 10k ohm resistors will work fine.