As Norman has said, I would suggest a Road Angel, this is linked to GPS and should be very accurate if you update the info in it regularly. The so called radar detector part of it, like all the others, is rather less use, by the time the thing sounds off to warn you you have been zapped, its too late to do anything about it, I leave mine in the box and just use the main, camera predicting, componant. I also bought mine from Ebay for about two thirds the normal price. And a quick note to veryhelpfulguy, the fact that ten people a day are killed on English roads (if it is indeed a fact), does not actually mean that their deaths can be attributed to excess speed. In fact excess speed is only the sixth most common cause of road fatalities.