I'm so desktop first, it's not even funny. But this is one of the few things I do on mobile. When I have the chance to go for a long ride I do the routing every few hours or so. This because I'm using something called Turfgame.com to explore new areas and take zones for a competition. I need to plan the route between the zones and maybe change route in case someone blocks my path. This will be done on the phone while having a break somewhere. I'm using Ride With GPS for the recording of the path and Naviki for the routing because that has all the turf zones as POI's so very easy to reroute.