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My car shows an average of 4 kph more than the GPS, but this difference increases with the speed, to almost 10 kph, when I hit ~ 130 kph. The one on your dashboard is affected by a lot of factors, from the size of the tires mounted on your car (if they are bigger, the car shows less) to the wear of the mechanisms involved in displaying the info. TomTom also added Predictive Flow Feed for better predicting approaching traffic delays, with the goal of improving optimal route calculation and ETA. The GPS displayed speed is the most accurate, so it should be odd. Otherwise altitude is calculated based on a (3d) GPS. Regarding the estimation based on current speed, what happens if you stop at a traffic light? The barometric altimeter will plot your attitude based on barometric pressure (after you calibrate it). Never liked Garmin I have only used devices based on WinCE, on which I can install my own software (usually iGo). Oddly enough, the actual speed displayed on my Nuvi is more accurate than the mechanical speedometer in my old Mercury Grand Marquis LS. My Garmin Nuvi calculates my ETA based on my actual driving speed, which makes perfect sense because I might just be driving like a "Little Old Lady" if I'm just out for a pleasure drive. Each segment of the trip has a speed limit assigned to it. at least, that's how all gps programs do it. Ohaha wrote.the realistic way to calculate it is based on the local speed limit, for each section of road, not on your driving speed.
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