I currently have the NEX4100 and for the most part love the receiver. I recently bought a Note 4 after having broken the screen on my N6. (Just came across a deal to good to pass) I've never had an issue with the Nexus with regard to AA navigation, but I noticed today that the Note doesn't keep a good GPS lock. I read somewhere that the new Kenwood units use an onboard GPS chip with AA. I was curious is the higher end Pioneer units with Nav built in would use their onboard GPS or still use the GPS from the phone? Is there a GPS dongle I can add to my 4100? Any suggestion would be helpful! If I replace the unit I'll be passing on the 4100 to my wife's vehicle for her to use CarPlay anyway.