Came across How to make fancy road trip maps with R and OpenStreetMap via a HN thread. It’s a little bit over my head but squarely within my interests for sharing my journeys/wandering. Another HN user commented with their efforts (in Go, written in Russian) to produce similar for their sailing trips, but it lacks any technical explanation. Still useful as artefact or ‘prior art’.

Yet another user linked to Here Dragons Abound: Exploring procedural generation and display of fantasy maps.