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Hey, I'm just going by personal experience. I install these things for a living, along with other car electronics and accessories, and I've noticed a trend over the years. I've actually had portable GPS and in-dash GPS units in my car multiple times and from what I've noticed, the in-dash units seem to be more accurate on the whole. I'm not claiming I know exactly why, just using reasoning to know that the speed sense is really the only difference between the two, and making my assumption.
GPS signals aren't 100% accurate on these portable navs.. you aren't paying for the technology. If you've had them in your car, you can see when you are driving and you pass a street, and then look at your nav and you will see the street either before you or after you on the screen. Sometimes its pretty close, sometimes its way off. When you are using the turn by turn features, sometimes when you come up to an intersection and you turn, the nav shows you turning too soon or too late sometimes when, in fact, you are turning into the intersection perfectly. This doesn't happen with the in-dash units that I've used, at all. Maybe because they cost more, they incorporate better technology, or maybe its the speed sense, I don't know that for sure. Believe me or don't, all I am saying is that I've installed 100's of these units and this is what I've noticed.
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