Outdoor Recreation Archive

fēnix 5 Series How to Clean a FIT File

How to Clean a FIT File

Former Member over 7 years ago

Howdy!

I completed a half marathon trail run partially in a canyon; the GPS accuracy was terrible: https://connect.garmin.com/modern/activity/2298490004

Here's a better activity listing closer to what it should have looked like, done by somebody else on the same course: https://connect.garmin.com/modern/activity/1311516155

I'd love to marry my activity to the official one, throwing away the bad GPS points to bring my total run down to a sane 13.1 miles. Is anybody aware of any tools that can help me accomplish this feat? I had to delete the activity from Strave and RunKeeper, as it came in at around 16 miles (!!) and gave me some insanely inaccurate PRs. I don't mind manually going data point to data point on a map and dragging dots around if I need to... but this seems like it could be automated.

Thanks for any help!

Rob

Top Replies

Former Member over 7 years ago +1

hi Rob,

Relying on GPS for pure distance measurement under canopy is fraught with danger. I do a lot of MTB'ing so got myself a speed sensor, that in combination with the wheel diameter stored in my Edge…

All Replies

0 Former Member over 7 years ago

hi Rob,

Can you attach the .fit file from your trail run in a reply to this message. I can then overlay the official course into it.

cheers
Mike

0 Former Member over 7 years ago

Sure! I'd be interested to learn how you make the fixes; I had another half marathon register at 13.04 miles I'd really like to stretch to the full 13.1.

0 Former Member over 7 years ago

hi Rob,

All file repairs are done using the Fit File Repair Tool - available from here.

Give this file a try.

cheers
Mike

0 Former Member over 7 years ago

Hi Mike!

The map on that looks a lot better, but somehow the distance still lists 13.86 miles. I suspect the area around South Falls (1:23-1:28ish) is a bad spot.

That looks like a great tool, but I'm a Mac guy and it looks like it has some pretty deep Windows hooks. I wonder if the developer would consider porting it to the web! :-D

Rob

0 Former Member over 7 years ago

hi Rob,

Relying on GPS for pure distance measurement under canopy is fraught with danger. I do a lot of MTB'ing so got myself a speed sensor, that in combination with the wheel diameter stored in my Edge, gives me pretty exact actual ride distances.

Maybe time to invest in the foot pod or the running dynamics pod?

cheers
Mike

0 Former Member over 7 years ago

Hi Mike-

I actually was running with the HRM-Run, which I think has all the same sensors as the RD Pod. I just saw Run was set to use GPS only instead of GPS+GLONASS, so fixed that for the future.

Are there other settings I should use to try and get distance measurements out of my HRM-Run?

I might just fire up a Windows VM and install the trial of Fit File Repair Tool to try and clean up that run.

Rob

0 nradov over 4 years ago in reply to Former Member

The HRM-Run will give you running dynamics metrics but not speed and distance. You need a foot pod to get speed and distance where there's no GPS signal.