10
The issue of the phone knowing where it is does not seem to be straightforward. I have on mine an app called OSM Viewer, which instantly keeps track of where I am as well as showing useful detail (eg bus stops, house numbers, official and unofficial footpaths). But it doesn't plot a route. I have another, called On The Go Map, which isn't always good at keeping track of where I am, but does plot routes (different routes for walking, cycling, and driving, as well as straight lines). And then I have OS Locate, which has no map but just gives grid ref, which I'll use in conjunction with a map. And finally, I have cycle.travel app for actually plotting cycling routes (On The Go Map plots routes on the basis of shortest distance, including legalities such as banned turns, but takes no account of eg a road being a quiet street or a d-c A road). I started using cycle.travel on the phone because the screen on my ~10 year old Etrex 20 was becoming dim, and I suppose my eyes older, and I was sometimes missing turns.