Is multi-level navigation inherently unfair?

[DavidHH]

On the video if after the control on the sw corner of the fence you had carried on north there was another tunnel heading west which later joined up with the tunnel that you did take.

I can see the confusion with the other more northerly control in this area. but this one seemed ok to me.

[Slowtochide]

A couple of thoughts on this topic
Mapping underpasses, especially under narrow bridges, is very difficult to get clear. I have explored a number of alternatives in a recent map and liked none of them. The best option is the purple passage overprint but even that is not always viable. If in doubt have a look at control #160 from this weekends BOC sprint final. Getting to it required a leap of faith from the competitor that there was really a way to get to the control...

I found my control in the multilevel area at Bath with no problem having picked out the relevant underpass with no problem so haven't focused on the rights and wrongs of the map but IMHO people often seem to worry too much about Up and Down. What matters is whether the way through is mapped clearly, then it doesn't matter if the steps (say) are up or down.

Having planned at the Barbican and also created some guidelines for this kind of thing I would say that the key point is Planner / Mapper teamwork. The map needs to be clear but the Planner has to choose control sites with care. So, for example, I would never site a control on a narrow bridge directly over an underpass because of the ambiguity, no matter what I could put on the control description. And having been to a lot of urban and sprint events in the last month or so I have across quite a lot of ambiguity as well as 'creative' control descriptions (c.f. #157 in the Sprint Finals)!!