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So I checked out OsmAnd's route planning today. It was... interesting. I plotted a sort of loop and it took me on something of a wild goose chase, but I didn't really mind that. What I did mind was it directing me over a railway footbridge (lots of steps) and into a brick wall, but I had strayed off route so I can probably forgive it. But it's perfectly adequate for what I need, I didn't have any trouble following the directions and the voice commands (while annoyingly American) were audible enough. For no money, I cannot complain. Would be good if it recorded the ride so I could upload it to Strava, but other than that, a great recommendation. Cheers.
Garmin 1000 with openfietsmap.nl maps on which have cycle paths marked, OsmAnd on the phone for when I want a bigger overview (get it off fdroid for the full version without in-app purchases, download all the relevant maps before you go, https://f-droid.org/en/packages/net.osmand.plus/ ), plus a vague idea of the direction I'm going in so I can use the local street signs. French cycle route signs are green and white like this: https://en.francevelotourisme.com/tips-and-advices/signposting-and-marking-of-cycle-routes-in-france