So, you're saying you actually leave for trips where you need navigation and don't bring your cell phone? I always have my phone with me when I leave home and I suspect most people do.
No, I believe he is saying: on trips, use the cell phone.
IMHO: Aside from the additional screen size, it's fairly counter-intuitive to tether cellular data from the cell phone, to utilize internet-connected navigation on a tablet. When you can, quite simply, just do it all on the phone itself.
I personally agree with this basic premise.
Unless I go about creating a fancy rig for the tablet in the vehicle, that makes it seem like OEM navigation/touch-based control (with or without physically installing it in the console - as has been demonstrated with the Nexus 7, though I don't care to look up the reference for this at the moment), I'd rather just let the phone handle all such tasks.
Aside from screen size difference, if both phone and tablet are Android, there is no other difference that makes it worthwhile.
Of course, if you want to truly utilize Google Now, and have not flashed JB/4.1 onto the phone, then I guess there is something to gain from letting the Nexus 7 or other tablet with JB run the navigational duties.
But having two devices connected for charging to do the duty that one can feasibly do with no limitations, I don't see the point.
Then again, in my case, that would likely mean 3 devices connected for charging - I still rely on my ZuneHD for audio. 1) there are pockets where data connection is dead, so Spotify or its ilk are worthless if streaming, and 2) Microsoft has yet to open up Zune Pass to non-Microsoft devices and I :wub: Zune Pass.
I'd kill to have Zune Pass, or whatever it'll be called in the future [as Zune is becoming Xbox Music] available on Android. I can easily sync with my MotoACTV, and could use my Galaxy Nexus as my audio source in my vehicle.