Most SAT NAVS are only as good as the operator, My sister in law got a new one and programmed it to take us from Anglesey to Portsmouth, I knew the way from Anglesey to the M6 so told her to switch it on when we got on the M6.
When she switched it on we carried on down the M6 but it told us to take the next exit, go round the roundabout and take the third exit but as I knew this was wrong we carried on, at the next exit it did the same.
When I pulled into the service I discovered she had put the postcode in wrong and it was trying to direct us to Edinburgh