On my recent hikes, navigation is a job made much easier thanks to a splendid (iOS) app: MotionX GPS. Many national and country parks have well-demarcated walking trails that make it possible to not get lost even without a map and a compass or a GPS device (not that going without is ever recommended!), but other areas – like the peaks, or even the tame Chilterns where I was over the weekend – are slightly trickier. Very often, rather than a designated route from point A to B, ramblers have to devise their own original challenges and find their own…