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Trail running again

ozzie7362
Now I asked a question a while back about the trail running section of the 645. Here's another sorry.

Now I've used this function on 2 trail runs now and each time it has added extra miles to my run, first run it added 2 miles more and today in a race which is measured at 16.4, the Garmin measured 17.8. now I understand it can be a bit out, but come on, over a mile or two in the other case. I am running with friends with older Garmin's and Tom Tom watches and theirs are accurate. I do not get this using the running function. Do I have a faulty watch
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    How does the path look on the satellite view in Garmin Connect? Although the total deviation is high as you say, the difference is less than 10% of the total distance.
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    Yes can you post a link to the activity - usually where I get inaccuracies the watch under measures (usually cutting corners)
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    Same for me, for trails I'm much more likely to have undermeasurement than overmeasurement. But for it to be a super small amount. Last weekend I had a run that would be officially measured at 104.4km (15 loops of 6.96km) and it was measured at 103.97 I'd say that's less than 1%, but given that I likely walked at least an extra 0.5-0.8km back and forth to portalets and around the main aid area, it's likely 2%. Still, that well within the margins of error. And this was in smart mode instead of every second mode which I use for training/shorter races. I've mentioned in another thread that there's a group run I do which is always the same course with the same start/stop points. And I get 4.96-5.0km consistently. It's about 35% curvy single track with fun switchbacks.

    More specific to your question about the trail running function, the largest difference between the trail running and running to my understanding is that trail running doesn't use the performance metrics. I.E. you don't get a penalised vo2max for going slow with a racing heartrate up the hills.

    As others have said take a look and your maps and see how consistent your path looks. The activity I mentioned: https://www.strava.com/activities/1734596712 . The map only has a small part where the tracking didn't look too great compared with the other laps and the satellite images.

    Lastly are you using GPS only or GPS+glonass? Some of the other people who complained about bad distances had GPS+glonass. I have GPS only.
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    Do you use UltraTrac mode?
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    I've just looked at the settings and noticed it's in ultra Trac mode, would this be why?