The siri/android problem doesn't seem to happen with the dedicated GPS nav systems I have. Maybe its a sample rate problem with phones (trying to save power), o

The siri/android problem doesn't seem to happen with the dedicated GPS nav systems I have. Maybe its a sample rate problem with phones (trying to save power), or just better smoothing, or relative plotting with the dedicated receivers. 5M is less than the distance between most highways and their frontage roads, so blaming the GPS signal itself for being unable to determine if your on the frontage road 15 seconds after you got on the highway is pretty lame. I frequently run my ten year old TomTom, alongside my wifes iphone or my android on road trips. The tomtom is pretty much always dead on with respect to lanes/turning/etc, while the iphone/android regularly feeds us crap. That said, I would kill for google maps (pc browser version) style route planning on the tomtom where you can click various roads and get time estimates even if goggle doesn't think its a good route.