@ pichlo, sorry I do not have sailfish . But I will look into your posts and see if I can help you.

One thing is the position api can get different positions. So after some time you should get exact values when your gps signal is fixed.

First I would set position method option to "posm=onlysat".

A good approach would be to use the [limit=integer] option.
Set it to 80 and this would lead to one print out with a fixed gps position.