noise issue about Grove GPS

I bought this module, but with no luck to use my arduino 2560 to read information from it. I do not know what reason it is, but I find the output data from NEO6 is really noisy, and I guess that might be the reason I could not use the microcontroller to read the information.
Today I tried to use Max232 to connect the chip directly to computer, I could see the message streaming to my PC, but I still could not get data from my Arduino. Anybody has the same experience? Thanks.

I have the same trouble with Seeeduino ADK 2560 + Grove GPS.
The demo code is taken from the Wiki site does not work.
What did you use the connection with the arduino 2560 + Grove GPS?