Thanks Maurice your comment did not imply to me that you had, hence my question.
I have not used it,but I feel that it represents progress in the Sat Nav field.Comments from Herbie, Gdamorini and Len I found are interesting.
I must confess that the older I get,the more suspect I become about any view that is expressed in the Press and much prefer to make my own mind up based upon my experience and acquired information.