Hi Amey,
If you buy one of the WiFi cards that is on the list of supported cards (like the Intel N135), it will work out of the box, just use the slightly bigger firmware image on an SD card and not the small image that's on the onboard flash (the small image does NOT have wifi drivers, etc.).
You don't need to put the NMEA data on the SD card, you can if you want but that's up to you, if you have a WiFi connection, you can send it to a server or send an e-mail, it's all up to you what you do in the code.
/Thomas
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