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Belagerent-
Extra files for extra cake stops.
If it was just an ad hoc adventure, touring, I'd probably just detour and then find my way back onto my route manually. In a race I'd either have full alternative routes or possibly just the detour section next to the route file I'm on. There's usually not that many so I remember them and decide at the time which option to use.
hippy
I normally throw two versions of the route in.