The purpose of this compare is to show how an older model Nuvi like the Nuvi 500 can have certain features that the newer top end Nuvi's don't have and vice versa. The now discontinued Nuvi 660, Nuvi 760 and Nuvi 765 were capable of playing music and yet the current series cannot. The question is, why? Why does Garmin add and remove at will? Or is it at will? I did a comparison between the Zumo motorbike GPS, it may give some clue.