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.