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Jun 2012
9:53am, 19 Jun 2012
60,796 posts
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GregP
I only attach a speed and cadence sensor on a turbot - and I suspect nobody* uses them for running.
I suspect Hammer's argument is specious. I shall read it again.
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Jun 2012
9:59am, 19 Jun 2012
4,663 posts
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JJ Flash
Does connecting your sensor to a Turbot make it wok better? Sounds fishy to me...
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Jun 2012
10:01am, 19 Jun 2012
60,797 posts
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GregP
Right. I hereby declare I think Hammer's argument is bollocks.
Regardless of different devices using different datasets, a Garmin device records to TCX, a Garmin-native format that incluses, iter-alia, maximum speed data. How can 'maximum speed' be open to interpretation?
'Well Garmin says 31 but it should be 34'? Get tae France.
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Jun 2012
11:56am, 19 Jun 2012
2,970 posts
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sprouty76
You can actually get a footpod for the garmin that will measure running speed in the absence of a GPS signal (for treadmills, mainly)
The TCX file has a seperate max speed field at the top of the file that was calculated by the Garmin using some algorithm at the time of the ride / run / whatever, using whatever sensors were available at the time. strava is (was?) presumably ignoring that and just looking at the raw location data, smoothing the speed over some period (which may be a different period to that used by the Garmin but probably can't be any less than 1 second due to the recording frequency) and then calculating the max of those.
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Jun 2012
12:00pm, 19 Jun 2012
60,805 posts
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GregP
Seems wilfull, Spouter - unless it is demonstrably more accurate, which I doubt.
This (from an MTB forum) I think sums it all up nicely:
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strava is only vaguely accurate. Don't get too caught up in times (ie, don't use it for racing for sheep stations).
Treat it as social media for cyclists and you'll be fine.
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On another note, I used to have a footpod for an old Polar, and it did what it did very well. Looked at getting a garmin one but they are quite pricey and I couldn't justify it.
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Jun 2012
12:06pm, 19 Jun 2012
2,972 posts
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sprouty76
Yeah, seems a bit weird that they could presumably have a social media for cyclists that was equally as accurate as Garmin Connect, Fetch et al.
The max speed thing aside (which could have several plausible if unverifiable reasons), I genuinely can't understand how the durations can be so different.
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Jun 2012
12:12pm, 19 Jun 2012
60,808 posts
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GregP
As I understand TCX files (which is very little), getting it 'wrong' actually takes more effort than getting it 'right'...
There are two people that really know about this stuff - one is Mr Fetch, and the other is HollyWoof who I believe is no longer of this parish.
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Jun 2012
12:21pm, 19 Jun 2012
11,288 posts
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fetcheveryone
What's the question?
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Jun 2012
12:23pm, 19 Jun 2012
2,978 posts
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sprouty76
I think it's "Do you know why strava is so inaccurate?" 
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Jun 2012
12:31pm, 19 Jun 2012
19,873 posts
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Frobester
Or is it "Whither Hatstands"?
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