All my units Old and New have best Acc of 4mtrs, the Geo maps are Mosaics of 100K and 250k the Topo is a full 250K of WA or whole Australia and is from Geoscience Aus and is more acc for the Main Roads in OZ which I use to get me there, I have also been using the app TT NDS Mod from here.
Spoiler: Pic
Screenshot 20201112 092851 Australian geology travel maps

As you can see the track matches the main road enough but tracks off road change all the time due to weather.