I think it's important not to change the ridability too often. The rider wants to know how fast he can go from one trail crossing to the other and doesn't use this information to navigate.

Sometimes it might be useful to use the pink "bar" symbol too. This indicates when you have to get off the bike, usually to cross a lying tree or pass a barrier. But this weekend we also had it when we had to cross a stream (see here north of #2 or in the circle of #19). I had to get off the bike, while some riders might be able to bike it. I still found it a good way to show a technically difficult passage.

What I find difficult in the example you show is how to prevent people from cheating (thus going off trail and cutting the switchbacks). This will require very careful course planning.
 

I'm trying to avoid changing the rideability often, but I'm not sure I've figured it out yet.

I noticed a few places where a purple bar would have been good when I was out yesterday. All but one of those was a fallen tree (from Hurricane Issac which came through Kansas last week). I can imagine checking for fallen trees a day or two before an event would be a good idea.

I don't think cheating will be a big problem as long as I make the rules clear in advance. I'd thought I might make a few areas where cheating would be allowed - perhaps mark some places where it would be allowed to go off trail to connect to another trail. I would then mark them on the map and streamer them in the terrain.

I haven't competed in a MTB O' event. It looks like fun, but we don't have any of that going on around here (and very little in the US as a whole). I figure the first step is create some maps and do some training sessions. I've been thinking that a summer MTB O' series around here might work.

Michael
 

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Purple bar - I was looking at a local map with the possibility of mapping it. To do so, I reviewed the isom specs for MBO which includes no reference to a purple bar. Can you provide anything substantiating this symbol. I agree it would provide useful input for the rider, but where did it come from?
George
 

George

It is symbol 843 Dangerous object across tracks or paths, stairs. It is in the 2010 MTB O standards.

Michael