I thik I've worked out what it might be - I think I may have stopped and then restarted the timer myself, by accident when I was trying to press the lap button - but no way was the timer stopped for 23 seconds - more like 5! There were mats at the start line and I started my watch as I crossed the mat and again when I crossed the mat at the finish. Don't know if I had autopause on or not (I haven't figured it all out yet)
It doesn't really matter - I was pleased to finish in under 70 minutes, I just want to know why they are differing so much! Next time I go for a run, I will use the Garmin and a stopwatch and compare the two - presumably if my Garmin is that far out I have grounds for a new one?
ps How do I get it to record splits? I pressed the lap button at each km marker, but only got the time of the last one.
Edited: 22/09/2008 at 21:16