What if you want to install the next year's version?
My current 2005 toyota has a map on DVD, and it's not got all the roads, even the ones that existed then. A repacement DVD is 90+ dollars! but mine is good. OTOH, one for 2011 is only $20, but I'm guessing it won't work right??? And I don't know if it has many more roads or not. Maybe it only has more recent stores.
And I don't see anything newer than 2011, so I figure they don't use DVDs anymore. ??
I don't need navigation, only occasionally to know where I am.
If the GPS map on new radios isn't a lot better than what I have, I'd rather save a couple hundred dollars and get a radio withou it.