Nokia Sports Tracker and Jitter
That is, if the underlying technology worked properly.
On the picture you can see a short trip I did yesterday evening. In real life it's about 3 - 3.5 km in a pretty suburbian area. The GPS weather was bad, so the GPS location kept jumping back and forth all trip, and those jumps were calculated in my overall travel. The somewhat funny end result of all this was that my average speed over this trip was 66.9 km/h, with a maximum speed of 150 km/h, as the total distance - according to GPS - was 34.38 km (that's a tad over 21 miles to all you metric-challenged people). My phone probably now thinks I'm an athletic junkhead giant robot on a particularly bad dose of speed.
Anyway, my point being: GPS, even if you have good equipment (I have a Sirf-III), is not always to be trusted. It works correctly so often, that when it fails, it can spell a catastrophy when you don't pay attention. The human factor cannot be removed either: a colleague recounted a story where he and three friends were trying to find an unfamiliar place, and they all had GPS units. Unfortunately, they all also managed to input the same, wrong, address in the device, and ended up miles away where they were planning to go...
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|"Main_blogentry_280307_1" last changed on 28-Mar-2007 10:21:26 EEST by JanneJalkanen.|