This GPS module worked as expected. On connecting over USB, a COM port device was detected. Driver was automatically installed on windows 7. When the serial port was opened in Hyper terminal, the output NMEA sentences appeared every 1 second. I have tried using internal patch antenna and an external antenna from Probots. With patch antenna, it was difficult to get a good fix, even in open sky, But with external antenna, the first fix was available within 30 sec. Overall a good and low cost module to start development on GPS.