1. brucedroid's Avatar
    I got a Samsung Gear S3 recently, and I've taken it out for 2 Runs to test it's GPS accuracy.

    For the runs, I've have:
    Location : on, with gps & wifi,
    I'm using the built in S Health App.
    I also ran with no phone (so just the watch standalone)

    I configured Samsung Health so that Strava is a connected Service (i.e. it will send the running data to Strava when i get home after a run)

    First run:
    * S Health said : 5.1Km in 28:05 (5:30 / km)
    (when i got home it did a data sync, as expected, to Strava which gave me my results)
    * Strava said : 5.2km in 26:30 (5:04 / km)

    Second Run
    * S Health said : 5.05Km in 26:49 (5:18 / km)
    * Strava said : 5km in 25:00 (4:58 / km)

    I understand Strava might decide to "correct" some data, and maybe the distances would be different based on different algorithms of GPS points, but oddly the distances are similar, but the times are different!?

    A few things I've noticed
    * The split time of the first 500m is definitely off when running, almost as if it hasnt got hold of GPS at the start of the run. (The avg km/hr for the first 3-4 minutes in S Health starts at 6 and works its way to 12, when I'm probably running fastest then)
    * The general map does look correct - as in, its tracking my location fairly well
    * Samsung says the 3-4 Km was fastest, Strava says the 0-1. Strava i'd think is correct there.

    I know Strava is not a natively Supported app, but its getting the same data from S Health, so the differences are a bit odd.
    04-20-2017 05:13 AM
  2. brucedroid's Avatar
    I see a few comments here which imply this is not unique:

    It seems the export to Strava is not working 100% at the moment.
    04-20-2017 02:54 PM
  3. p1eric's Avatar
    I experienced exactly what you are describing back in November '16 when I first got the watch. I think S Health is sending the wrong total time to Strava but I don't have any data to back it up right now because I deleted those "bad" exports in Strava and then manually imported the GPX files. I'll re-enable the Strava connection and then go for a run tomorrow and report back with the results.
    04-21-2017 07:31 AM
  4. brucedroid's Avatar
    Thanks p1eric. I also found if I exported the GPX file and manually imported it into Strava the run recorded fine.
    04-21-2017 08:03 AM
  5. yoggee's Avatar
    Brucedroid, try setting location to only GPS. It's more accurate. Take a short trial run to see the difference between S Health & Strava.
    04-22-2017 06:39 PM
  6. p1eric's Avatar
    Here are the results of my test.

    In S Health my workout duration is 34:01 @ 4.04 miles. S Health has the pace listed as 8:19 per mile although my calculations are 8:25 min/mile. I'm not sure how they came up with that number.

    Samsung Gear S3: Samsung Health and Strava Differ on time-shealth.jpg

    Strava is using Moving Time to calculate pace. So 33:05 @ 4:04 does calculate to 8:11 min/mile. The problem is I have no idea where the 33:05 is coming from. I don't see that value anywhere in the S Health app.

    Samsung Gear S3: Samsung Health and Strava Differ on time-strava.jpg

    My best guess it S Health is calling the Strava API and setting the wrong value for Moving Time. When you do a manual import it uses the min/max GPS coordinate times so it ends up being correct. Either way the pace in Strava seems to be calculated by Strava, not sent in as a value from S Health.

    Interestingly the data exported to Runkeeper is accurate with the pace matching what I calculated.

    Samsung Gear S3: Samsung Health and Strava Differ on time-runkeeper.png
    Yesterday 09:42 AM

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