Bug: Elevation Data is wild & inconsistent

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Seens Tee

• December 17, 2022 06:03
• Edited

Version 1.349.1396 elevation data is all over the place. Elevation software settings to "calibrate now" are difficult to access and inconvenient to remember for every ride. Please introduce Auto Calibrate Elevation when device is Powered-On. This should be automated. Thank you

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  David Fox

  • December 17, 2022 13:55

  Excellent idea!

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  David Fox

  • December 17, 2022 13:57

  Or even better, when a ride is started.

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  Anna Ronkainen

  • December 17, 2022 15:01

  Auto calibration is already there, shouldn’t have to press “calibrate now” if you have it on (the altitude may be off initially after turning the unit on if it hasn’t found a GPS signal yet, for instance right now I’m supposedly 92 metres under water...).

  Elevation data is all over the place for sure (check the altitude profile for your ride if there are spikes where the altitude changes suddenly), but in my little experiment I found that automatic calibration on (and mobile data off, which somehow seems to be the main culprit here) gives the best results.

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  Seens Tee

  • December 17, 2022 19:03

  Anna: it seems auto calibrate is auto on demand by pressing "calibrate now" vs manual you enter the actual digits. I've seen current elevation drop by 100 feet when pressing calibrate now. Hence it is not auto in my experience. I do have an internal sim card so maybe I will remove it.  

  David: Thanks! I do think it would have to be triggered before a ride starts so we dont record bad elevation readings for a even a second. 

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  Seens Tee

  • December 17, 2022 19:10

  Also, even without elevation spikes recorded the data is still off more than 15% when compared to other head units on the same ride and also when compared to Strava corrected elevation data. 

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  Anna Ronkainen

  • December 17, 2022 21:21

  If you are going to the menu before starting a ride, I think the calibration just hasn’t happened yet. I never bother to press “calibrate now” (this is not aviation after all, a couple of head unit generations ago I had the thing set up to just set the altitude to 16 m asl at start regardless of where I started...) and the altitude at start is the usually the part that makes the most sense (especially in regions where the altitude spikes are a big problem with mobile data on, just turning it off without removing the sim card should already help quite a bit).

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  Seens Tee

  • December 17, 2022 21:53

  One thing to note I power on my Karoo 2 about 5 - 15 minutes before riding to give it time to sync to gps/elevation/altitude/ and run a few circles in the parking lot before taking off. I'm in coastal San Diego so not much altitude here. Will test mobile data off and see how it goes.

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