CONFIGURATION:
Important: the module is now wifi bidirectional (version 4.0). Please check the forum on this site for more information.
The module is totally wifi configurable. When you supply power to the module for the first time, it will start with factory settings and it automatically creates a wifi network named NMEA2WIFI. You should disconnect your smartphone (or your PC) from other networks and connect to this NMEA2WIFI network using the password 12345678. When you are connected you write 192.168.4.1 in the navigation bar of your browser and you will receive a web page like this, which allows you to fully configure your module. See the sequence of the images that follow for more details.
The pictures in this set refer to version 3.0. Present version is 4.1 and wifi bidirectional. The last picture is a "test" screenshot of SeaWifi (obtained here) showing 19,385 NMEA sentences being received at a rate of 16 per second and with zero checksum errors.