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