everyone should use sat nav at all times, it avoids speeding tickets like you wouldnt believe. i got banned once, got caught again after that, had plenty of close shaves and warning from cops, then i got sat nav and i've never been close to getting caught again (touch wood). i dont need to use my speedo because it beeps when i speed in an area where there are speed cameras. it has different noises for different types of camera, it has every type of camera in its database, i can choose the type of warning and when it happens, basically it is my favorite gadget since the mobile phone and a real life saver. the navigation is very handy as well (although as with most things i dont advise idiots to use it)