I actually find them pretty accurate for me. It currently says:
5k - 18:04 (I did 18:09 in November)
10k - 37:29 (Haven't done one for a while, but I think I could get close)
HM - 1:22:53 (I did 1:22:57 in October)
FM - 2:53:05 (I'll know how accurate that is a week on Saturday!)
Interesting - as far as I can tell they are calculated by a simple formula based on the watch’s estimate of your VO2max.
Mine are so far off, that all I can assume is that it is telling me that I am extremely fit (the Garmin app page for VO2max tells me the flattering news that “your fitness age is that of an excellent 20-year old. That’s the top 1% for your age and gender”. I’m 63), but absolutely crap at running.
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