Does anyone else have this system? I had it bought for me this xmas and am keen to use it but so far I've noticed it's about as accurate as p!sshead armed with a blunderbuss. It's about a kilometer out on my 7.5k running route and claims I'm running at a pace that'd put Haile Gebrselassie under pressure. The manual claims you can calibrate it post run if you know the distance ran (which I do, almost to the meter) but I can't find the menu that allows you to do this, despite following the pam. Also the other way where you run 400mtrs doesn't seem to do anything. Any ideas?