How x and y can be right and z completely wrong?

Reach Module / M+ / M2 Getting started
1

Hello everyone,
I know my question is quite common on this forum, but I still have not found the solution …
Let me explain: I work in RTK with two Reach RS, which allows me to obtain a very good precision in x and y (max 5cm error). However, I have a big problem in z. The value of z is indeed a fifteen meter of the real value of the altitude.
How x and y can be right and z completely wrong?
I use the basic feature to work in RTK.
The base works in Single and the Rover in Fix

Thank you if anyone can help me

3

Hi Barth,

The altitude you can see in ReachView is ellipsoid, not real orthometric altitude above sea level.

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