the extraordinary quality of Ordinance Survey maps suggests this was far from trivial, even if an iOS map app was a priority for OS, which i doubt.<p>Anyone from the UK already knows this but for those who plan to travel in the UK, these are the finest maps i have ever seen or used, and indeed have used them a lot. The 1:50,000 sheets for N Wales (Snowdonia), Isle of Skye, and Applecross, among many others, are treasures.<p>taking a casual walk with the family (e.g., around Langdale in the Lake District) with a OS 1:25,000 OS map is an interactive history less every step of the way--"oh look, says here there's a Celtic burial chamber just up ahead on your left"