GoPro HERO2 Plug iPhone/iPod Connector =~ match

http://pinouts.ru/PortableDevices/ipod_pinout.shtml
16 GND
23 5 VDC (+)
25 Data (-)
27 Data (+)
http://chargeconverter.com/blog/?p=71
16.IR input
23.Adapter output —
25.VBat+ external power input ?
27.GND