For all you guys who have iPhones, do a search on iHUD and download this app. Really cool. It's basically a real time speedometer with access alerts to speed trap cameras. But the awesome thing with it is that you can reverse the image, put it on your dash and you get a cool HUD on your windshield! Works best at night but I like it b/c it shows you real speed. I have oversize tires so it's good to know actual speed when cruising. I'm about 5 mph over the dash speedometer when going 60+. I'll get a pic posted at night so you can get a better view. I compared it to the speed indicator on my Garmin and it is very accurate.