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Nov 2020
3:01pm, 1 Nov 2020
12,465 posts
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larkim
Track shouldn't make that much difference, but it would make intervals a little bit faster I suppose.
I mainly follow P&D which does intervals at 3k-5k race pace, but total interval distance is 5-6k, and they suggest tempo at somewhere between 10m - HM race pace with "slower" runners (their term!) aiming for closer to the 10m version.
GPS errors are possible but not so gross as to make paces wildly different if your watch is broadly trustworthy.
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Nov 2020
4:07pm, 1 Nov 2020
998 posts
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SKR
GPS readings on the Track are definitely not accurate . you're meant to manually lap on the track. I think its the Coros watch that boasts accurate track GPS readings but i guess even thats a gimmick.
Try doing the same session on a stretch of road and you'll see the difference.
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Nov 2020
4:42pm, 1 Nov 2020
12,466 posts
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larkim
In fairness my watch measures pretty accurately on a track, certainly races of 1500m / 3000m haven't measured worse than about 0.02 of a mile "wrong".
Even if grossly wrong it's not going to do much more than turn a 6:00 measured mile into a 6:10 GPS mile or vice versa. For the purposes of marathon training, not hugely impactful?
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Nov 2020
5:09pm, 1 Nov 2020
32,141 posts
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SPR
Coros track mode isn't a gimmick. In fact Garmin track mode probably exists because of Coros.
If you want to do track intervals, just get your lap splits. It's a measured distance...
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Nov 2020
5:25pm, 1 Nov 2020
16,777 posts
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Chrisull
Crikey my Garmin can't even measure a straight mile correctly, always comes up as 0.97/0.98.
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Nov 2020
6:01pm, 1 Nov 2020
12,467 posts
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larkim
Similar error rate to what I described then Chris?
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Nov 2020
6:24pm, 1 Nov 2020
32,142 posts
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SPR
I think most people have a much worse error on track than 0.02 for 3000m.
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Nov 2020
6:42pm, 1 Nov 2020
12,469 posts
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larkim
0.02 per mile. Just looked back and my track 3000m usually record as 1.88m, some 1.86m, some as long as 1.91m. 3000m is 1.864miles. It's always impressed me how close things match up.
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Nov 2020
6:43pm, 1 Nov 2020
999 posts
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SKR
Mine are usually much worse which is why I don't do my sessions at the track any longer. (Well that and it's usually too busy anyway).
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Nov 2020
6:56pm, 1 Nov 2020
293 posts
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Big_G
I've done a couple of track marathons and they have both measured very close to 27 miles.
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