On the last 2 Betas (currently using 21 Jan update), I've not been able to adjust the altitude readout.

When the ALT box is touched, instead of the keyboard to input altitude correction, I get the error:

The altitude reported by your GPS chipset is not relative to mean sea level. Please contact SkyDemon to obtain a file to correct the reported altitude.

Is there a file available, (or am I too thick to find it?  )or is this just a glitch applicable to the beta releases?

Regards,

Max

There is a file available, and you'll need to add it to your device. After that, the altitude will be automatically corrected no matter where you are in the world. We'll be creating a knowledge base page for this when we release, but in the meantime, you can contact us by email and we'll get it to you if you need it.