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I hated having to just blindly trust someone else's GPX file
I always blindly trust someone else's GPX file.
Mostly. Often, I'll redraw it in RWGPS using OSM maps, if for no other reason that it looks neater and the Garmin is less likely to beep off-route! with tracks that better follow roads. Doing this NEVER equates to a better understanding of the 'ground situation' in my brain though. It's like two totally separate things.
As an aside, if I'm dragging the missus around I'm probably more likely to avoid busier roads. I've spent years having wing mirrors whiz past my head. I don't think she needs that in her life.
I have a pretty good navigational memory from plotting the route in the first place (I hated having to just blindly trust someone else's GPX file). The K&SW detour was easy as I knew we should end up on the main road after the fishing village forays so it was an easy choice. I'm also quite hard skinned when it comes to traffic so I don't mind a bit of main road bashing in order to make my life easier.
Last Audax was in 2017 I think (and one that you rode, although you'd already left by the time I got to the start and then there was no chance of catching you).