Thanks Angelo. I would have done the tests using off-road mode to disable 'lock on road' in suburban twisting circuits, but would have neglected to use 'Pedestrian'. I can easily do the test today in the outer 'burbs with plenty of trees, but if you require big city buildings that test will have to wait a few days.
I'll also enable the trip log in map layers so it's visible during the test, but doubt i'll have much opportunity to compare the 4 trails in real time as i'll be alone in the car and will need my attention elsewhere mostly. ;)
In regard to the log data, do you want bin as well as gpx files? I would have logged only gpx, but if you also want bin file let me know what Binary Log types you want enabled. This stuff is over my head, i know how to view the gpx coordinates etc in G7toWin but that's about if for me. I'll need some precise guidance from you blokes if you want any fancy data to play with later.
In the absence of anyone replying with further directions, i'll start a half-hour test after about 4 hours from the time of this post [it's about 21:50GMT 04 May now].