thats the app that i use for hacking at it is amazing, i love how it shows you the route you have taken, helps as then you can do it again, if you werent to sure where you were going, unfortunately it drains the battery really fast
I use View Ranger for hacking new routes. Shows OS map with all bridleways etc and uses GPS to pinpoint your position on track. Will also leave snail trail in case you get lost and have to backtrack.