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GPS Accuracy today

  • 07-05-2015 10:53am
    #1
    GreyEagle
    Closed Accounts Posts: 318 ✭✭


    Did anybody notice the accuracy of their GPS plot today, Thurs 7th May? I noticed a distance error of more than 2% against known landmarks. On uploading to Garmin the track on the map did not overlap on "out & back" sections. I thought this was unusual as track and distance are normally spot-on.


Comments

  • #2
    Tenzor07
    Registered Users, Registered Users 2 Posts: 9,158 ✭✭✭Tenzor07


    Solar Flares


  • #3
    bazermc
    Registered Users, Registered Users 2 Posts: 3,116 ✭✭✭bazermc


    My garmin 500 told me on Sunday (last) that sections up towards the Sallygap were 644% gradient

    Does that count?


  • #4
    GreyEagle
    Closed Accounts Posts: 318 ✭✭GreyEagle


    Thanks Bazermc. I checked on http://www.tesis.lebedev.ru/en/sun_flares.html and this morning's cycle exactly matched the time of increased solar activity reported on the site. I have learned something new today.


  • #5
    bazermc
    Registered Users, Registered Users 2 Posts: 3,116 ✭✭✭bazermc


    GreyEagle wrote: »
    Thanks Bazermc. I checked on http://www.tesis.lebedev.ru/en/sun_flares.html and this morning's cycle exactly matched the time of increased solar activity reported on the site. I have learned something new today.

    Damm so I wasn't spinning my legs contador style on 644% gradient and not even out of breath.


  • #6
    magicbastarder
    Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 50,890 CMod ✭✭✭✭magicbastarder


    how much error would you usually expect to see in a GPS track? i'm using my phone (galaxy S5) and have seen a difference of over a KM in spins under 40km; i.e. one spin i did recently shows up as 38.2km in strava, but the exact same spin a week earlier is 39.5km - and you can see the older GPS track is more ragged looking on the map.


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  • #7
    JBokeh
    Registered Users, Registered Users 2 Posts: 469 ✭✭JBokeh


    magicbastarder wrote: »
    how much error would you usually expect to see in a GPS track? i'm using my phone (galaxy S5) and have seen a difference of over a KM in spins under 40km; i.e. one spin i did recently shows up as 38.2km in strava, but the exact same spin a week earlier is 39.5km - and you can see the older GPS track is more ragged looking on the map.

    It depends on how often it saves co-ordinates, they work by collecting a location point at a set interval, and then joining the dots afterwards to give you your line. Which is why if you look closely you'll see the GPS records you cutting corners and the like. The accumulation of this can add up to a fairly significant amount of distance. I'd say a phone would have a longer interval than a standalone GPS so it gives you a bigger error.


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