Problema with the altimeter measurements

Hi everybody!

Im using the watch to run usually and there is no race with an accurate altitude measurement. I’m making almost every time the same route, I have a little hill to “climb” to see the the measurement when I go ad come backwards in this point the gps route is in the same spot, but the difference between this two points is very big. The route starts higher that it ends, even if the start and the beginning is the same…

One thing that I have to mention is that the temperature measurement is activated with a maximum 3 degrees threshold, I’m not sure if it is enough to alter the altitude / barometer.

attached in the picture: this two peaks are the same gps position.



Any ideas? Is your altitude inaccurate too?

thanks in advance!!!