And in response to here (and on FB curiously) with regard to this subject and the VintageAirRally.
When you're already flying a labour-intensive aeroplane, with an open-cockpit, average radio quality and high ambient noise - using an electronic NAV solution is clearly the way to go for a bunch of reasons. There's a video on youtube showing a chart wrapped around the tail! :-)
As far as another thread on here is concerned, however, we've never claimed to be doing it without modern aids. Erm, because we are doing it with modern aids!