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Elevation drift
Posted: Tue Jul 17, 2012 6:44 am
by KimG
Has anyone else noticed that the iBike elevation setting drifts? I set it on Friday but come Monday it a about 200 feet higher. The roads I ride are a bit bumpy and broken but if shocks from broken road surfaces are causing this I think that there may be a design problem. Other than that everything else appears to be normal.
Re: Elevation drift
Posted: Tue Jul 17, 2012 6:51 am
by Velocomp
Elevation drift is caused by changing barometric pressure, which is caused by changing weather. This is completely normal for all barometric pressure measurement systems.
Re: Elevation drift
Posted: Tue Jul 17, 2012 7:03 am
by KimG
I don't mind having to check/set the elevation before each ride but I don't recall that being addressed in the Newton+ documentation. This brings to mind another; question doesn't the elevation play a roll in the watts calculations?
Thanks for the quick reply.
Kimball
Re: Elevation drift
Posted: Tue Jul 17, 2012 7:32 am
by Velocomp
KimG wrote:I don't mind having to check/set the elevation before each ride but I don't recall that being addressed in the Newton+ documentation. This brings to mind another; question doesn't the elevation play a roll in the watts calculations?
Thanks for the quick reply.
Kimball
No, elevation is not involved with watts calculations.
Re: Elevation drift
Posted: Fri Aug 17, 2012 5:40 pm
by Zoltan
I see that apart from any barometric driven elevation drift, there is a drift of appr. 1/3600 feet per sec (actually I estimate it 1/3592). I have a very small sample I checked just one ride file before concluding it. Is it just for some doublechecking purpose? Or is it the result of some elevation tweak by the user?
Sorry I am a newbie with Isaac and for the time being I am just setting up theories.