What you have said is just not the case. I eventually got this working on the new release of the software but by trial and error and reading the help files. However, if you are tracing your route on GE then the results you get from using this approach are very subjective. You'll need to trace your route carefully on GE and if you have a track width lower than the standard 10 mtrs you are unlikely to achieve smooth corners particularly on uphill hairpin bends.Which tutorial is it? This one matches your thread title but being written for an older version makes no difference. The later versions of BTB simply show each vertex of the selected surface in the 3D view and show other surfaces as coloured lines.