Thanx Chas I must have spaced out on that thread.
Now on to the lack of voice guidance. I must say in all honesty that this is entirely the wife's fault. In this Maisun unit (her car and hence after installing it I haven't really touched it since - and of course no manual came with the used unit) there is a stupid little button right next to the Disc Eject whose only purpose in life is to cut the Audio from the Navigation. I guess she must have ejected a disc and inadvertently pressed the eject as well as the disable navigation audio.
I do apologize. Unit works as advertised and strict instructions have been given about not touching said button. Will it be remembered? Doubtful, but I will if it happens again.
Again thank you
siberian