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cookiemonster
Not done this particular Ultra yet nor have I ever ran a race by organisers - Centurion but understand they are very good at these events and the website info says it is marked.
They do have a GPX map of the route and when running Ultras I always download this as I find it reassuring and it quickly tells you you're off course.
It is also 5 laps of a 10 mile route which could make it easier to navigate after a lap or 2 .
One issue of navigation (if Mrs Cookie has no GPS/mapping) which might crop up later on in this particular race ,is it will be dark early in November.