Polarized sun glasses block the picture from the TomTom. You cannot see the screen if you are wearing polarized sun glasses. Rotate the TomTom 90 degrees or so and the picture becomes very readable, but what a crummy way to look at the TomTom.\r\n\r\nTry it out and (don't) see. TomTom sez they use polarization to improve the picture-\-\- big mistake. How in the devil do you see a TomTom with polarized eye glasses in New Mexico when they have blocked out the picture unless you rotate the screen 90 degrees?? Somebody had their head up their shirt.