Headerless Sparkfun ArduPilot Mega UAV controller - how to connect to usb without usb port

Hi there guys,

I just aquired one of these

https://www.sparkfun.com/products/10294

however there is no headers and I have been searching throuhgout the internet for a pin-out document so that I can solder a ftdi or usb cable to the unit. No joy so far,

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