What’s needed is for someone like Viewranger to sell an App that will allow customers to download sections of OS map to their phone in the same way that you can over the ‘net at the moment. As the facility to allow in-app purchacing will be provided in OS3, currently in beta, due to be released next month, then there is no excuse for the likes of Anquet, Tracklogs, MemoryMap or Viewranger, or anyone else for that matter not to do a Mac/iPhone version. Selling the basic app for 59p, with a UK base map, then selling sections for the same £20 or so that they go for from the website would be ideal. C’mon people, get your act together, there’s a large Market waiting to be tapped.