Altitude meter apple watch

Hey there pekka257,

Thanks for reaching out to Apple Support Communities. We understand that your elevation is inaccurate. We're happy to provide some assistance.

Does this occur in all locations or specific locations? Do you use a magnetic band? We ask because this might effect results. Look under the "Add the elevation complication to the watch face (Apple Watch SE and Apple Watch Series 6 only)" section here:

Use Compass on Apple Watch (Apple Watch SE and Apple Watch Series 5 and later only)

We hope this helps.

Have a great day!