This calibration does not work at all. The altimeter (at least on the Vivoactive 3) is complete garbage and does not work, and Garmin just won't admit it. In my case, it is always, always, always, several…
This doesn't seem to work for a number of people for the VA3 as shown by this thread. There seems to be an issue with either the device hardware, software or the design of the ports on the underside…
Yesterday my apartment in Amsterdam was at altitude 400 metres. Could be correct because I'm on the 8th floor. Today, according to Garmin, my apartment is only at altitude 60 metres. Now I know that Holland is a flat "low-country", and sometimes we get that sinking feeling over here! But really...really? Garmin, come on now, give us all a helping hand. A fix is long overdue!! Cheers
I’m in the same boat as everyone else. My vivoactive 3 is way off. On a run my watch will think I ran mt Everest in half a mile and then pancake flat. Bike ride total elevation is always off (high) by a few thousand feet. The past few rides and runs say I’ve done 0ft elevation gain. I’ve tried the auto calibration multiple times, and made sure the ports are not gunked up, but nothing seems to work.
I would return it for a new watch or a better model. Mine worked perfectly for almost 2 years. Then with a software update, the altitude quit working. I've contacted Garmin and they follow a script of what to tell their customers. No help there. I'm now looking to switch brands.
Can you try the different GPS settings for an activity? GPS gave me an elevation of 400 ft for a known elevation of 110 ft. I changed the setting in the activity (walking) to GPS + Glosnass and the elevation then 'corrected' to 88ft - much closer to the real value. I then switched back to GPS only and the value shown during an activity has remained within 10 to 15 feet (negative) of the actual location. Please note that 'correct elevation' is very difficult to establish - try a few websites to check your own location and you will find that they can give values that vary (in my case) by 10 or 15 feet.
Of course when you are NOT in an activity, the displayed elevation will bear no relation to your location. It goes up and down with barometric pressure from the displayed value from the last activity. Only when you start an activity will the elevation 'correct' itself to the value transmitted from the GPS Satellites.