The Sena system is often used for Inter-Bike communication during motorcycle trips together, using Bluetooth connection!....>>>
http://www.youtube.com/watch?v=WsNo4spsNkQ
I think most of the Chaps just use the "Senna" device fixed to the helmet, for inter-communication, with a microphone and earphones, and the Video recording uses their Go Pro Cameras.
Both Video and Audio are recorded and stored on each device.
The Video and Audio conversations are then mixed together during the final editing process.
..alternatively...>>> http://www.sena.com/product/bluetoothaudiopack/
My problem is....
Satellite communication using "4G" stuff, Bluetooth stuff, etc, on Mobile phones, GPS Maps, etc, is a magical work of art for me!
I only have a Land-line telephone, communicating via copper wire, and basic Broadband, copper wire for Internet use!
Out on the road I only have a basic (£25), Pay-as-you-go Mobile Phone, for emergency breakdown.
"i-phones" and "4G" etc, expensive contracts are sometime in the distant future...

So...what have I got?....
A (£45) SJ Cam 4000 Video Camera.
Does the same job as a Go-Pro camera, but a fraction of the price!...>>> http://www.sjcam.com/en/cameras/27-sjca ... t-dvr.html
The only difficulty is, it only has a built-in microphone, (The Go Pro has an expensive add-on, for audio recording via a Microphone).
My options are.....
(a) Wire a separate Microphone to the circuit board inside the camera to replace the existing one, to record both video and audio.
(b) Purchase a separate audio recorder....>>> https://www.zoom-na.com/products/field- ... y-recorder or similar and mix the two recordings together during editing!
I think I'll try (a) first of all!
At the moment I am just inserting "text" into the videos during the editing process.
Not quite as good as instant recording on the fly whilst riding!
The Sena System is very versatile, but can be quite expensive!
http://www.sena.com/product-category/mo ... wersports/
More experiments to do!
Paul....
