I find the "GPS.Show GPS" quite useful as well
A nice hidden feature and not documented.
Definitely one of the more useful features. Just a pity it has to be re-enabled after every update / beta install.
It could provide some insight as to why some people get snapped to side-roads instead of where they think they are.
It enables a smaller arrow showing your actual GPS location on the map, in addition to your car icon or arrow.
If this veers off the road, it might just assist to indicate how far to tweak some roads to keep you snapped correctly, assuming the WME GPS layer does not average it out for you.