Elevation issue

Answered

Comments

10 comments

  • Avatar
    Franklin Prince

    Hey Ronald. Sorry for the trouble. 

    Please write to support@hammerhead.io with your Karoo Serial Number and we will help you out.

  • Avatar
    Dirk

    Franklin, this is already a well known issue and still not solved. I waited for SW updates.....
    If you do a manual setting, in my case minus 2 mtr. Keep it on manual. Wait 24 hour. And noticed a vslue of plus 57 mtr. ( the Karoo was switched off and on). Also switch to Auto did not solve the problem. So yes Ronald I have the same problem.
    @ Franklin keep us informed on this thread as well what the solution is.

  • Avatar
    John Hendriks

    Today again the elevation was not correct. If I set it on manually it is not correct, if auto it is not correct. After every ride I have to click recalculate height in Strava???

  • Avatar
    Gilles muoy

    "If you do a manual setting, in my case minus 2 mtr. Keep it on manual. Wait 24 hour. And noticed a vslue of plus 57 mtr"

    this is perfectly normal though Dirk, and just means that the atmospheric pressure where you live has changed from one day to the next. If you use manual, you have to set the elevation each time, in order to match elevation to current atmospheric pressure...
    As a side note: mountaineers whom for that info is vital would even calibrate several times a day. Meteorological conditions change all the time, and for them, knowing how fast barometer readings deviate allows them to anticipate bad weather. 

    Not sure how Karoo works, but vertical positioning via GPS satellites is only accurate +/- 30m that's just the limit of the technology available to us. Some units would further refine that reading through cross referencing with altimetric maps... which are just as accurate as the maps they use (yes, they are full of errors)

    one last method is to match user input to GPS coordinates... in theory that would be the best way to do it, but my garmins fail to give correct readings nevertheless (I suspect the issue being related to difficulties to read correct GPS position at start of ride and/or difference of temperature between inside/outside)

    Anyway, calibration only affects absolute elevation, which is neat to know, but secondary to us cyclists. Most of the relevant data we use are based on relative elevation (slope%, altitude gain/loss, ascent/descent speed etc.)

  • Avatar
    Allan Urquhart

    I do not see why the manual input requires to be entered into the Karoo prior to every ride. The automatic option does not pick up my elevation correctly either - this is not an ideal situation at all.

    My Garmin Edge 1000 picks up my elevation +/- 2m constantly - no issues - no errors - it just works and to be honest - the Karoo should be the same!

  • Avatar
    Ross Jantz

    With regard to Giles post - Sorry, but claiming that auto elevation calibration with GPS isn't accurate enough isn't going to fly with users who waited months for their Karoos because HH decided to redesign the antenna to make it super accurate (not to mention the hype of comparative GPS tracks between Karoo and Garmin). 

    Its just not that hard. I should not have a reading of +400 ft. when I turn the unit off and then -400 ft. when I turn it back on the next morning just because a storm came through. I understand barometric pressure changes, but if the Karoo goes that far off without correction how can I trust even the relative elevation changes? While in use the unit MUST adjust automatically during rides (without an inclinometer, GPS seems to be the only recourse - otherwise how can it tell whether I'm climbing a hill or if a low pressure area just came through?).

    It should be relatively safe, not to mention incredibly simple, to have the unit remember what the elevation reading was at the time it is turned off and use that as the starting value the next time it is powered on.

    As Alan says, and particularly after all this time - it should just work! (at least as well as the competition!!)

  • Avatar
    Gilles muoy

    Hi Ross: just in case there is some confusion, I do not work for hammerhead - my avatar looks different because I'm part of the beta test group. Apart from that, I'm just a normal paying customer like you.  😊

    Also, I was not trying to make excuses for hammerhead, just giving you the answers some engineers at other companies gave me when I asked them what was wrong with altitude... actually, in some cases it was even worse than just having to calibrate manually: I contacted Suunto when my GPS only watch would report me climbing when actually going down (or vice versa), I contacted Garmin when my Edge 820 would report random starting elevations in spite of my using the "remember manual calibration for GPS coordinates" feature! Basically, there is a reason why none of them got rid of the manual calibration: it is necessary, whatever brand we use (well... at least, as far as my experience with such devices goes)!

    anyway, I've noticed that auto calibration on Karoo doesn't do too bad as long as I start it with good conditions for GPS signal (start it outside, staying still, in a place with clear view of sky... ) and connecting to the internet not too long before using it probably helps too (many GPS units use a file that needs to be updated periodically in order to be able to predict accurately the position of satellites, which in turn helps with GPS precision)


  • Avatar
    Steve Hammatt

    @Ross - GPS determination of altitude is a lot less accurate than the x/y determination of position via GPS. I agree that Karoo's elevation calibration is pretty bad compared to Garmin etc. Though frankly given the multitude of other issues with Karoo I'd much rather HH focus on fixing basic stuff, given that it's usually pretty easy to just manually input an elevation at the start of your ride.

     

  • Avatar
    Ross Jantz

    I wasn't meaning to imply that Giles was part of HH (the 'advanced test group' thingie under their logo is pretty obvious) - just pointing out the irony. Also, no question that altitude is less accurate with GPS. My point was twofold - first, there are simple programming fixes that would make it at significantly better and two - without some kind of adjustment even in-ride changes cannot be trusted. 

    Yesterday I set the elevation to what I know it to be at my home location (why is it again that they can't implement that?), rode in to work then rode home in the afternoon. The ride record for the afternoon showed me at -166 ft. and with elevation changes that do not match what I know to be true.

    This IS part of the basic stuff that needs to be fixed - though I'll readily grant that not needing to define and download offline map sections with each update, periodic factory data resets to fix random weirdness, the inability to define layouts, TbT directions that cannot be trusted, audio alerts and a host of other issues are just as, if not more important.

  • Avatar
    Allan Urquhart

    I'm still having issues with the elevation.

    I'm now inputting a manual elevation every morning before my commute - the results are +/- 3m but on my commute home the values are all over the place +/- 75m. The bottom line on this is that the Karoo HH cannot perform basic functions which is criminal nearly 2 years on from shipping to the public.

    I for one have had enough and going back to my Garmin until this is finally put to bed.......who knows I may even get a replacement Garmin with the full refund that I'll be demanding from Hammerhead :-(

Please sign in to leave a comment.