can i calibrate altimeter?

I have returned my first apple watch thinking that the altimeter was faulty. I bought another one and same Now I am finding that it does not work accurately at all and can't be calibrated. Why even say this is a feature?

Apple needs to either drop the claim that Apple Watch has an altimeter feature or this should be fixed.

There is no way to calibrate the altimeter;

The barometric altimeter in Series 3 or above watches uses changes in air pressure to estimate this. Simply put, the higher up you are, the lower the air pressure, thanks to gravity and physics. Even climbing a single flight of stairs will result in a subtle but measurable change in pressure. This is what the Activity app uses to estimate how many stairs you have climbed.

Apple’s built-in Workout app records this with the Elevation Gain metric, which is the total number of feet or meters you climbed during the workout.

I'm having a similar question for my AW6.

When I display the realtime altimeter on a watchface, it very, very often gives a ~ symbol before the height. In that case, I know the altimeter isn't displaying the right height.

For example: my hometown is at 14m above sea-level. Now sitting at my desk, it displays ~264m. When I go up or down the stairs, it exactly counts one meter more or less depending my activity on the stairs. So the altimeter's sensors works perfectly; but it seems like he doesn't know his exact location on earth.

The watch and my iPhone Xs Max are connected together. Both can use GPS data. By using GPS data, should be possible to display a more accurate height.

Isn't it possible to calibrate that altimeter by using GPS info?

On another forum, I've got a tip from someone who've had the same issue.

When I went for a walk or running using the workout on his Watch, the altimeter became calibrated.

Here in Belgium we were not allowed to celebrate New-years eve IN our homes due the Corona pandemic. So we made a fireplace in our garden and stood outside with friends.

At a certain moment the altimeter was calibrated and gave the correct altitude.

So it seems the watch needs to have a proper GPS connection. I've always thought the iPhone or the watch needs to have a proper GPS signal to calibrate.

I need this altimeter in the open air, so when he calibrates when you're outside for a while I'm satisfied.

Still now he gives 14m. That's exactly the right height here.