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One bonus for that idea, if it works, is that is if you go out of range, it'll easily come back once back in range whereas sometimes bluetooth can be funky.
The better way to do it would be rider headsets which would also give you bike to bike comms.
Yes. This is your answer. Not sure how easy or reliable it is, but Sena offers this feature. It will not share the GPS audio, but it will share the music.
Bluetooth isn't going to have the range to reliably do this.. but this is such a strange request on so many levels.. Sounds like you may be better off just riding on the back of his or vice versa.. LOL
Yeah...I was thinking it was kind of gay. But, didn’t want to say it. So, here I am saying it?