FAQ answer at www.honestjohn.co.uk The Snooper Lynx at £199.99 seems like a good idea because users can update all other users when they spot a mobile trap, but the GPS subscription is £9.99 a month. Nav Now offers a similar device on offer at £149.99 with a year’s subscription, but does not have the user update facility. More on that at www.nav-now.co.uk/novus With ever changing limits, seemingly calculated to catch drivers out, and no requirement to repeat 30 limit signs, the important advantage of these devices is they tell you the prevailing limit where you are as well as your car’s true speed.