advice asked zumo or navigator

[bowser]

I have been searching through threads but other than the Navigator IV not being able to be used in a wired mode if fitted into the bmw cradle, I can seem to find what else is different between the Zumo/Navigator IV, can anyone tell me?

Whats the advantages, disadvantages of either?

 

[bowser]

20 odd views and no comments, sombody must know what the differences are between the zumo 660 and the BMW navigator version?