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There's a pretty good cell phone application out now called SPEEDVIEW, based off of GPS satellites of course.
You activate the application and it places a small speedometer with a digital readout on the screen of your phone. Then if you tap the screen again it places only the digital readout in larger white numbers and reversed. Place it on the dashboard and it reflects into the windshield as a HUD (heads up display). If you exceed what GPS thinks is the speed limit where you are driving, the digital numbers turn red.
It works on my Droid X, but I am not sure what other cell phones it should work with. I am tickled to death with the application. The Excursion speedometer is not the largest and easiest thing to read in the first place.
Been there, tried this. I used my Iphone and initially it worked great. HOWEVER, the windshield, being two pieces of glass sandwiching the saftey plastic, gives a double, yet small, view as a HUD. It was about 1/16 - 3/32s off and drove me nutz! I want to put one in but the only way to do it without ghosting is to get the clear laminate from Cadillac, if they still have it, and put it in your field ov vision for your phone.
This is just my experience but I am still looking at my options to install one.
Best of luck if anybody else tries and I want to see what happens to others, good topic!
HUD is futuristic !!!!
the android app was cute when we tried it, but makes it harder to text while driving when it's way up there
also, both our Garmin nuvi gps's do that on their screen...
Only problem is that it's based on map data that may not have correct limits....
AND... I ignore that overspeed indicator when it turns red just as fast as I ignore the speedometer