![]() ![]() Missing data points would yield a shorter distance, as having less in-between points would generate a straighter-than-actual path on the other side, erratic measurements usually produce longer distances as some data point end up being somewhat far away from the actual route taken, thus making the route longer. ![]() The two biggest sources of GPS errors are missing data points (due to obstructions) and erratic measurements (due to interference). Even though the algorithm used to calculate the actual route from those data points may be different among devices, they all use some sort of smoothing so I don't think the algorithm has much influence. All GPS devices (watches, smartphones, navigators) use the same basic technology and just differ on the antenna sensitivity and the amount of data points they take by time interval. Scedastic, RunningAHEAD (a free online running log) has a route measuring tool based on Google Maps that I think would be fairly easy to use for your purpose, you should check it out. ![]()
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