can anyone tell me in easy terms what the diffrences between the modles are

 

I know what the avic n1 does but what features does the radio do diffrent that the software wont upgrage?

 

n2 do diffrent than the n1?

 

n3 do diffrent than the n2?

 

n4 do diffrent than the n3?

 

n5 do diffrent than the n4?

 

I noticed that pioneers website says that the n4 and n6 have a bigger screen,7 inch compared to 6.5 is this true?

 

thanks