The GPS Shield for Arduino connects to your Arduino board to provide position, speed, date and time data.
The module has a U.FL antenna connector. The product picture shows the included "internal" antenna connected to the module.
The assembled shield has a Vincotech A1080-B GPS module that uses the standard NMEA protocol (www.nmea.org) to transmit the position data via serial port.
An Arduino board equipped with this GPS Shield equipped can be used with various NMEA-compatible software packages, such as:
More info on GPS navigation software can be found on Wikipedia.
GPS Shield Resources