It sure does! It alerts you at 300 yards before the turn, then as you are coming up on the road. Different voiced to choose from, plus many languages. Has a quick disconnect from the windshield for easy switching of vehicles. Built in antenna and an optional external antenna can be purchased seperately. I have no trouble receiving signals with just the internal. Car power adapter and a home charger cord come with it. It will run 4 hours with it's batteries. You can go to their site to view more details. So many I haven't even used yet.
TomTom Go 700
I think a nav unit installed in the dash where the radio is would be very hard to keep your eyes on. Also, I purchased my unit from Buy.com for $705. As you can see from the web site, they have it listed at $899.