@Ajax Bay Asking others for the answers used to be my policy. But after my last info control debacle I reached my limit. I thought "I don't even care about validating my ride, I'm only doing this because everyone else is, and you're making it difficult for me". So I decided that the next control that presents the least obstacle to me enjoying my cycling will result in the brevet card going in the next available bin. Like @Sea of vapours I'd like it if audaxes allowed validation based on GPS tracklogs. However I'm sure that GPX validation would present big technical challenges for an organisation run by volunteers, so I'm not really that fussed. I did look into DIY by GPS but the whole procedure seemed so opaque that I gave up trying to figure it out. And ultimately, unless I was doing a RRTY or competitively gathering points, it would be a bit pointless. But anyway it's not my organisation, I'm not an AUK member so it's not really any of my business how they do things.