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Perfect!
Though I wonder if it will cache the whole chunk again still? So, if you have a routing error that it can't deal with and it goes a bit funny, normally I just wait until I've ridden past the issue and then restart the route so it's sorted itself out. If it goes and caches the whole route each time though, it's never going to get rid of that routing issue (at least until that file is completed)
You can manually remove the cached calculation on an individual course basis.