2011 Touring w/sport Bose system upgrade question

mdezz

Hello,

Ok I am new here and Im trying to decide between a 2011 sport touring vs a 2011 sport touring with nav.

I would like to know if I buy the non nav car that has the bose system can I upgrade the head unit easily to include navigation without having to add some kid of external antenna that is visible on the dash? Can a new Double Din unit
take advantage of the built stock nissan mic and satellite antenna that comes with the car?

Id actually really like the Nissan Nav unit but the car is several states away and would require delivery fees and no real discount on the vehicle since my local dealer would have to go get it.

Thanks in advance
Matt