Hi.  Have the cable.  My intent was to use to power the GoPro now.  Later to use it with the FPV kit from 3dr.  I have read the install instructions and the 3dr video about the install of the FPV which includes this cable.  

Do I need a BEC and if I do, suggestions?

Still not clear on how to power the GoPro.  Anyone else doing this and care to offer up tips or a guide.

txs

M.