Garmin elevations in crisis.

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Milzy

Legendary Member
On the club ride my Garmin 1040 which is fresh up dated showed more climbing than everyone.
What’s going on, my computer is the best one out of the group & they’re all saying mine is over reading?
 

fossyant

Ride It Like You Stole It!
Location
South Manchester
By much ?
 

nogoodnamesleft

Senior Member
On the club ride my Garmin 1040 which is fresh up dated showed more climbing than everyone.
What’s going on, my computer is the best one out of the group & they’re all saying mine is over reading?
Is everybody else using a Garmin 10x0 or are you comparing your 1040 with Wahoo/Bryton/Sigma devices?

I have always felt my Garmin overstates ascent/descent but that's always based on a few m ascent and then looking at what the Garmin ascent increases by and such low ascents will be subject to a fair variation and precision.

I have once had a real anomaly on measured ascent on my Garmin 1040 (might have been the 1050). Ascent way off but descent sensible and it must have been an anomaly as it was circular from home and invariable ascent is within a couple of meters of descent and on this occasion it was way different. Next ride it had been restarted and not happened again.

Checking against an online route is also not particularly useful as onling route creation/analysis necessarily has to use interpolation and from that some estimation so I always regard the figures they give as an index rather than a true height eg this rote is 300<x> and the alternative 600<x> and best I can say is the 2nd alternative is twice the ascent of the first.
 

EckyH

It wasn't me!
Garmin 1040 which is fresh up dated showed more climbing than everyone.
Garmin 1040 and other Garmin devices guess the elevation by atmospheric pressure: barometric height "measurement".
Therefore I don't trust them not as high as I could throw them.

E.
 

Ming the Merciless

There is no mercy
Photo Winner
Location
Inside my skull
Garmin 1040 and other Garmin devices guess the elevation by atmospheric pressure: barometric height "measurement".
Therefore I don't trust them not as high as I could throw them.

E.

Atmospheric pressure derived is considered more accurate than GPS elevations. Only really a problem if you have a massive low or high pressure system moving rapidly across where you are.
 
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