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A bug following gpx track

Roberto Ena
over 3 years ago

Hi all,

I've a Edge 1030+, version 4.10.
I noted this behaviour, which I find very annoying. Is it common? Is it a bug that will be fixed soon?
I describe here the steps.

When I want to follow an uploaded gpx track, the device needs to "recalculate" the track. I can't see why, since it is a gpx track and I just want to follow it, regardless of the roads on the map. I assume this is to optimize the gpx forcing, when possible, to follow the roads that are on the Edge's map. This is ok (but see next step).

When on a sharp turn on a mountain climb, I see that I am exaclty on the track that Garmin recalculated, but sometimes I am slightly outside the original GXP, which has a finite number of points. Then, the edge says "off track, recalculating" (or something like this).

This happens very often and it is really annoying.

Thank you

Edit: I see my version is old. This is surprising, because my EDGE says that the version is the latest available. I'll update. Does anyone knows wheter this bug was fixed?

Edit 2: I attach a screenshot illustrating the issue, see my comment few posts below.

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  • 0 over 3 years ago

    There is no need to have the course calculated if you only want to follow the GPX track: turn off „turn guidance“: 
    home screen - navigation - courses - stored courses - 3-lines button right bottom - turn off guidance.

    If you find „off course warnings“ annoying - turn it off!
    Profile - navigation - routing

  • 0 over 3 years ago in reply to mcinner1

    Thank you. However I do want "turn guidance" in most cases.

    Could you please clarify this to me: when I load a gpx track, it says "calculating". I am assuming it is calculating the equivalent track on its own map. And using "turn guidance" basing on this recalculated track. It is more or less so?

    In this case the "issue" is that I am precisely on the recalculated track, but a little bit off the original GPX. Why is it telling me I'm off track?

  • 0 over 3 years ago in reply to Roberto Ena
    Roberto Ena said:
    Could you please clarify this to me: when I load a gpx track, it says "calculating". I am assuming it is calculating the equivalent track on its own map. And using "turn guidance" basing on this recalculated track. It is more or less so?

    That‘s correct!
    There are 2 magenta lines visible (some times): the dark one is the GPX track, the lighter one is the calculated route based on the activated map.
    There should be no „off course“ if you follow this calculated line.

  • 0 over 3 years ago in reply to mcinner1

    Hi, thank you.

    Thenk it's a real bug, because in fact I do follow the calculated line but still I have many "off course" warnings. It happens every time the GPX track "cuts" a sharp turn.

  • 0 over 3 years ago in reply to Roberto Ena

    Ok, then maybe I'm wrong and the "off course warning" appears if you deviate from the dark magenta line (gpx track) and follow the light magenta (calculated) line.

    (What makes really no sense...)

  • 0 over 3 years ago in reply to mcinner1

    The "off course" warning is based on the track. This is preferable.

    The idea is that the two lines should be nearly the same (which is necessary for "turn guidance" to work reasonably).

    If they are (more or less) the same, it wouldn't matter which line the "off course" warning was based on.

    The track is the primary thing indicating were you want to go. Turn guidance is secondary.

    Turn guidance is optimistic: you get it if the device can calculate it and it might not always be correct.

    Also, having "off course" warnings associated with the track means you can get it without turn guidance.

  • 0 over 3 years ago in reply to mcinner1

    Hi, thank you all :-)


    I attached a screenshot in the top post to show the problem.

    The magenta line was the original GPX. I imported it into the 1030+, and I started the navigation.

    At the sharp turn top of the screen, the 1030+ said "sorry, you are off track, I have to recalculate". You can notice I was perfeclty on the road (blue line is my activity).

    The brown line is the same GPX re-imported back. You can notice (you are surely aware of this) that the GPX is extremely simplified (~700 points vs the original 2700 points).

    I can understand there is some logic but you have to admit that the result is very poor.

    Every turn the device stops working andI have to wait it recalculate, which takes a lot of time, maybe because it's a 150 km tour.

    Yes I can disable the guidance but then it's not better than my old Etrex.



    Edit: I am not sure the simplification was due to the 1030+ or the s/w I use to import tracks into the device.

  • 0 over 3 years ago in reply to Roberto Ena

    I'm still not sure what you did.

    Are you using the brown GPX track for the navigation? The brown track would not work very well.

    What are you using to plan the route?

    The "recalculation" thing is not the same as the (basic) "off course" warning. That's related to "turn guidance". You might want to disable "recalculation",

    Your issue doesn't seem common at all (there aren't other people reporting it).

  • 0 over 3 years ago in reply to Roberto Ena
    Roberto Ena said:
    The brown line is the same GPX re-imported back. You can notice (you are surely aware of this) that the GPX is extremely simplified (~700 points vs the original 2700 points).

    What does that mean?

    The best would be you zip the course-fitfile from your Edge (folder /Garmin/courses) and upload it here so we can have a look what‘s going on.

    (the Edge does not reduce the trackpoints of the GPX!)