"There are also logistical issues. For example, because the iPhone doesn’t support background processes, any navigation app must shut down during phone calls, making real-time tracking difficult—something that doesn’t happen on a dedicated GPS unit, even one that includes telephony features."
This is the biggest drawback I've had with ANY phone based GPS application. I had the Verizon VZ Navigator on one of my phones in the past, and while it was a great GPS app, if you took a call or were on a call, GPS no workie. One time, I was on a conference call and wasn't familiar with where to exit on my trip. A while later I realized I MUST have missed my turn and had to hang up on the call and wait nearly 7 minutes for the GPS to reinitialize and find my location to then tell me that I essentially went 30 minutes out of my way... extending my trip by 1 HOUR!!! Ugh! I will never forget that mistake, and since have purchased a Navigon 2100max stand-alone GPS. The Navigon is truly awesome (none are perfect as far as I'm concerned) and has some incredible features. However, Navigon is pulling out of the US for both sales and map updates at some point in the not-too-distant future. They will be honoring the remaining subscriptions for map updates from their customers, but then that's it. What does this mean??? I'm not entirely sure, but I'm guessing I still have about 3 years of (up to date) life left in my GPS. Past that I have no idea, but technology changes pretty fast anyway and something better may come along by then.
For now, I will be staying away from any phone based GPS system/app. I think the Tom Tom package looks promising... but if it still means taking a call stops the function of GPS telling you where to turn, I don't want any parts of it.
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