Is the navigation on the z series the same software as on the D series? The logic the D3 uses to get me from point a to b is ridiculous sometimes.

I saw some posts about people getting interesting routes with the Z series.

For me I have never encountered such error.

I have a Z3 and all the routes have been very accurate and precise. I guess if you are unlucky you can get some bad routes if you live in a remote area.