As much as i love using my phone for a navi, i think a in car navigation is still a good way to go. Like Rated S said, the integration is good, keeps the phone fresh (not draining battery) and open to get calls and stuff, and not have the poss of missing a turn or something... all that junk... but it is still redic expensive for what you get. My Garmin on my BB has built in traffic and rerouting for it, whereas w/ an in car one (i'm pretty sure for any company) you need to buy the xm/sirius traffic for it to do it.... but still, in car is a nice feature to have.
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