Trying to undertsand how this works.

The default is 800' vert and 3.0NM horizontal.

I guess this means that if current track and altitude takes you to a point where vert clearance is <800', then at the 3 NM point you will get a warning on screen.

Or it could mean that if you are going to pass within 3 miles of a clearance <800', then you will be warned.

Also how does this work in the circuit and on landing? I have noticed being plagued with ATZ warnings in the circuit and have switched the machine off. But I dont remember terrain warnings  .. maybe these were switched off anyway.

What settings have others used to get the best balance?

David

PS Similar principles apply to obstructions I assume.

Turning off terrain warnings is as simple as unchecking the tickbox in the dialog specifically created so that people have control over which warnings are shown. Plus, terrain warnings are off by default. So I'm really not clear on what it is you're asking for here.