Garmin elevation Gain Discrepancies - Page 2 - Runners Forum
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  #16  
Old 19th Mar 17, 02:56 PM
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EIGT3 EIGT3 is offline
Real Name: John   Gender: Male  
 
2014: 368.00 miles
Week: 0.00 miles, 0 hrs 0 mins
Year: 0.00 miles, 0 hrs 0 mins
As far as I know, garmin uses your route and can then correct altitude details based on OS data that it accesses, there's an option to use this in your device settings somewhere if I remember correctly
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  #17  
Old 21st Mar 17, 05:29 PM
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westonbloke westonbloke is offline
Real Name: Peter   Age: 69   Gender: Male  
Location: Bath
 
2014: 143.00 miles
Week: 0.00 miles, 0 hrs 0 mins
Year: 33.09 miles, 8 hrs 43 mins
Naively I assumed that if my run came back to the starting point my Garmin would show the same elevation for climb as descend - but it never does. I am happy if it gets close to 1 metre difference but usually it shows a discrepancy of more than 10 metres.
The mapping is not that accurate either. On one occasion it showed me as running on the surface of the Solent - well out beyond low tide level - when I was not even on the beach.
So these days I just stick with total time and distance and hope they are accurate.
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  #18  
Old 22nd Mar 17, 11:19 AM
k_dence2 k_dence2 is offline
Real Name: Cliff   Gender: Male  
Location: London
 
Something I've wondered, is whether the x- and y- distances depend on the elevation. For example, suppose you ran 1 mile up a 20% gradient. You know it's a mile because you've used a distance measuring wheel. The distance you've travelled as seen from above is cos( arctan(0.2) ) = 0.98 miles. The elevation is sin( arctan(0.2) ) = 1000 feet approx. So does the GPS watch take into account the elevation, recording a distance of 1 mile and 1000 feet, or does it read 0.98 miles (yet still show an elevation of 1000 feet)?
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  #19  
Old 22nd Mar 17, 12:11 PM
Sam J Sam J is offline
Gender: Male  
Location: Eindhoven, The Netherlands
 
unless you are using a device with a barometric altimeter you will always have issues with height accuracy (and even with barometric it wont be perfect).

There seems to be a bug between the plotted graph and the total summation. I think it would be due to smoothing of the data for plotting.
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