Anyone done one of the 24 hour rogaining events? If so where? There seem to be a few around Europe but not even a sniff of one in the UK?

From what I can gather its like a 24 hour score mountain marathon with no break unless you want to and you just bivvy if or where you drop? Is that right?

Sorting my summer out at the moment and fancying a trip abroad for a race and either the European Kimm out near Geneva or a rogaining event somewhere. Just like to know what peoples thoughts are on them and if anyone has any to recommend?