The Nissan Path

Hello, I would like to replace my factory 7inch with aftermarket GPS. Is this possible or will I loose my BU http://movieseriesworld.com/ camera and climate control functions? Is there a Nissan upgrade I could get instead? Something has to give cause this stereo sounds like crap. Please help.

Giving the year of your Pathfinder would help and letting us know if it is a Bose system or not would help. Is it the radio or just the speakers? You could also try Crutchfield.com and talk to their Sales staff. They are always great to deal with and have a lot of options at fair prices.