I use a Sena SMH5 with my iPhone 7 & Nav V. Can't imagine the Nav 6 being any different.
iPhone paired with Nav V as a phone then Nav V paired with SMH5 as a phone. Then SMH5 paired to other Sena headsets. Works for me.
I was looking at getting a Sena 10U for my new Schuberth E1. But apart from the remote & FM radio it does just the same as my SMH5 , so I'm sticking with the SMH5 and saving £200
I can make / receive calls, listen to music and talk to my mate should I wish. I turn off navigation voice instructions.