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Originally Posted by supposedtobeworking
Well while were talking about speed--I use the 3:15 rule which can be found in Wazoo's tutorial if you're interested. It can be very effective in theory but I have found it difficult to get an entirely accurate speed reading myself. Occasionally the distance interval between one of my plots will be very different than most of the other intervals (difference of up to .5 or so km!), and the rest will not quite be the same (within .2 km). I guess this gets you close, but when I hear other people talk about this method it sounds like they can get dead on results...sometimes I wonder if I am doing something wrong (I'm just using the ranges from the Watch Officer precisely in sync with the stopwatch.).
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I don't think you're doing anything wrong, I use the same method and as you say sometimes there's an interval which is out of line with the others. I just discard it as having messed up somehow and take another. You do get more accuracy if you do several intervals. I also find that I can be out with the measurement because it jumps by 100 metres at a time, so I generally measure until the cursor just turns to the reported distance, this seems to give more consistency.