http://www.bhphotovideo.com/c/product/564655-REG/Red_Hen_Systems__Blue2CAN_Adapter_with_Holux.html
http://di-gps.com/di-GPS/index.htm
http://nikonrumors.com/2012/03/31/diy-30-wifi-solution-for-nikon-d4-and-other-smart-phone-additions-for-your-camera.aspx/#more-36682 

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