I'm a owner of Garmin EDGE 1030 Plus and by comparing it with my older EDGE 130, using both together with one Garmin Speed sensor I found, that the day distance is almost the same - the difference is for 50 km distance +- 400m. EDGE 1030 shows a little less. It seems to be OK.
If I recorded these two routes to Garmin Connect and comparing it, I found, that while the route is fully equal, any other parameters are different. I mean especially altitude. The difference is somewhere more than 30%, though I set in both device on start my home altitude exactly, (Home is 350m), the ride on EDGE 1030 shows start from 390m for example. Also difference in total ascending and descending between both devices is somewhere more than 50m.
I exported both routes to gps and recorded into Maps application and there are a little different values again. I know, that the alititude depens on barometric values, weather, temperature etc., but I expected not so big difference.
In one case is a difference for total ascending more than 20% compared to device. Maps takes the GPS values as basic, devices have a barometric measurement. But is it normal? I expected, that the top device from Garmin will be very precise and accurate and can use any combination from both...
Also ride time and average speed is somewhere more than 2km/h.
Can any experienced biker advise me, if is it normal? I have no comparing with any other biker now, I wanted to believe, that EDGE 1030 Plus is better than EDGE 130, but the results from EDGE 130 are in close proximity of maps.
Thank you.