I see this article as a bad review, does not mention the iPhone in the mix! I use Navigon, which works very well, does not require any internet connection for the location information, Very accurate and gives you early warning before the turn, connectivity to your car stereo with the available accessories, integrates the iPod function, and you can still take in calls without affecting your GPS, and then when you are in range of cellphone Google maps allow you to view the location as if you are on foot so that is a BIG PLUS for when you want to see landmarks before you are at your location. When I used a dedicated GPS for Pizza delivery called the Tomtom, it was not very useful, The biggest drawback was that the maps were out of date and needed an update which would have cost as much as buying a new up to date dedicated GPS that was not up to date anyway which would have been a simple software update on the iPhone's Navigon, The dedicated GPS often got confused and was very buggy, I remember the Tomtom attempting to send me to the next town containing a street with the same name a few times, and sometimes sent me on a field trip of many turns despite the street I am trying to get to was just 3-4 turns away causing me to be 1/2 hour late, and there is a lot more problems that I could fill a whole page with.
Really when it comes to the iPhone, the dedicated GPS is owned. The iPhone is the best investment that I ever made, the Navigon costs 100 bucks, but it beats any dedicated GPS especially when it provides better functionality than the majority, added with iPod function already in the phone that does not add any difference to the amount of gear you carry as it is just an app.
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