The Nav V which works in consort with the handlebar hand grip pod (I call it the "wheel") has a wealth of info and features. It is a fine system and an excellent secure mount. However the following is what I have found out after visiting with 2 different BMW parts/accessories folks in 2 different states and researching the web.
1. The only way to access all the features including full use of the "wheel" is to purchase the BMW communication system AND a Schuberth helmet. (System 5, System 6, System 6 EVO, Sport helmet, AirFlow 2). BMW communication system is close to $500 for one rider and the price for a Schuberth.... stupid.
2. To keep the warranty the dealer sends the communicator and helmet to Schuberth for the install.
3. Yes, you will find folks who have posted that they installed the system themselves or even installed the device in another brand of helmet. However, the BMW intercom has to be purchased with a separate NiMH battery pack that gets installed in the helmet. If your helmet does not have a removable neck brace padding like the high end Arai, you will be faced with a challenge to be able to fit that battery pack and the communicator on (or into) your helmet. The parts guys were honest about how they have looked into it, but the idea of no warranty and giving out info that may make your helmet not fit right or be unsafe, makes them stop.
Here is what I decided to do;
1. Purchase the Scala rider Q1 teamset for $230.
2. Install in my Arai and the wife's modular HJC was OK. I took my time and tried several different approaches to affixing the speakers, hiding the wires and position the mics. Success after trial and error.
3. Pairing the primary communicator to the GPS and iPhone is covered in the manuals and the online FAQ's. Again, trial and error, step back, beer, then repeat, got the job done.
4. The intercoms are not bulky and thank god the antennas have been replaced with internal ones.
5. Speakers are cheesy, but my wife liked hers fine. I took apart an older Sennheiser headphone system for my speakers and it is soooooo much better sound.
6. This system works best for our situation as we really wanted a easy to use, clear sounding intercom. The music and phone are less important to us.
7. You still get the gps audio commands. I am beta testing at this time to see what features of the Nav V you don't get audio on.
I am not promoting the Q1. There are several good systems to choose from. Again, the intent here is to give you information about the BMW communication system, the Navigation V and the reliance on the use of the Schuberth.